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Three-dimensional heat transfer model of oil-water two-phase stratified flow 认领 引用
1
作者 Hui-Shu Liu Ji-Miao Duan +4 位作者 Yong-Xiang Huang Hao-Nan Li Shuo Xu Shi-Ming Chen Hui-Rong Huang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期2120-2135,共16页
Oil-water stratified flow,a fundamental pattern in multiphase pipe flow,is commonly encountered in offshore petroleum production and transportation.Although hydraulic characteristics of this flow regime have been exte... Oil-water stratified flow,a fundamental pattern in multiphase pipe flow,is commonly encountered in offshore petroleum production and transportation.Although hydraulic characteristics of this flow regime have been extensively studied,accurate prediction of its heat transfer behavior under nonisothermal conditions remains a challenge.In this study,we develop a three-dimensional heat transfer model for oil-water stratified flow by integrating the energy conservation equation with established flow models and coupling it with momentum conservation.Turbulence is resolved using a lowReynolds-number k-ε model.The phase interface is captured via a minimum energy model,and the irregular physical domain is transformed into a regular rectangular region using bipolar coordinates to simplify grid generation and numerical solution.The model was validated against experimental measurements of average outlet temperatures for both phases,showing relative errors within 5%.Results further reveal how water cut influences the axial temperature distribution and highlight threedimensional temperature profiles during non-isothermal flow.This model provides theoretical insights and practical tools for optimizing thermal management and ensuring safety in offshore petroleum pipeline operations. 展开更多
关键词 Oil-water two-phase flow Stratified flow Heat transfer characteristics Numerical model
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Numerical simulation of multi-gasbag propulsion system and attitude control of release unit based on two-phase flow method 认领 引用
2
作者 Xinggan Lu Shenshen Cheng +2 位作者 Xiaoting Cui Kun Jiang Hao Wang 《Theoretical & Applied Mechanics Letters》 EI CAS CSCD 2026年第2期65-79,共15页
Collaborative technology for the remote,large-scale deployment of drones using dispersal systems holds significant potential in applications such as post-disaster rescue,which must balance low overload with high thrus... Collaborative technology for the remote,large-scale deployment of drones using dispersal systems holds significant potential in applications such as post-disaster rescue,which must balance low overload with high thrust,in addition to precisely controlling the separation attitude.To address these issues,this paper introduces a multi-gasbag propulsion system with a high aspect ratio that coordinates multiple gasbags to generate sufficient thrust.By adjusting the inlet size of the gasbag,the separation behavior of the release unit can be accurately controlled.A multidimensional two-phase flow model is established,accompanied by both combustion and flow experiments and a double-gasbag propulsion experiment.The results demonstrate that the proposed mathematical model is accurate,effectively captures the pressure fluctuations and spatiotemporal distribution of flow field parameters,and determines the separation attitude of the release unit.For the cases studied in this paper,the pressure at the gasbag inlet(z=650 mm)is the dominant factor during the gasbag propulsion response,causing the release unit to rotate counterclockwise when the gasbag inlet sizes are identical.Increasing the inlet size at z=50 mm compensates for the adverse effects of uneven axial pressure distribution,thereby achieving a neutral separation for the release unit.When the radii r1 and r2 vary between 2 and 12 mm,the angular velocity and attitude angle of the release unit are found to range from-15.50 to 15.20 rad/s and from-0.109 to 0.106 rad,respectively. 展开更多
关键词 Two-phase flow Dispersal technology Parameter distribution Attitude control Numerical simulation
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Wax deposition characteristics under oil-water two-phase stratified flow in pipeline 认领 引用
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作者 Hui-Shu Liu Ji-Miao Duan +4 位作者 Yong-Xiang Huang Hao-Nan Li Hui-Rong Huang Shi-Ming Chen Jun-Zhe Jiang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第5期2885-2901,共17页
Wax deposition in subsea pipelines transporting waxy crude oil under oil-water stratified flow remains a critical flow assurance challenge.This study systematically investigates wax deposition characteristics using an... Wax deposition in subsea pipelines transporting waxy crude oil under oil-water stratified flow remains a critical flow assurance challenge.This study systematically investigates wax deposition characteristics using an experimental flow loop that simulates deep-sea conditions.Experiments were conducted with waxy simulated oil and deionized water under varying superficial velocities of bothphases.Results show a crescent-shaped deposition layer exclusively on the upper oil-wettedwall,with no deposition on the water-contacted lower wall.Notably,the deposit near the oil-water interface exhibits higher wax content and enriched heavy components compared to the top wall,indicating localized aging behavior.A key finding is that increasing oil or water superficial velocity reduces deposition thicknessbut enhances wax content and promotes aging.The deposit mass per unit area correlates negatively with oilphase actual velocity,while wax content and heavy component concentration show strong positive correlations.This work provides novel insights into the circumferential heterogeneity and phasespecific agingof wax deposition in stratified oil-water flow,offering a foundation for improvedpredictive models. 展开更多
关键词 Wax deposition Oil-water two-phase flow Stratified flow Heat and mass transfer
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Two-phase differential game guidance scheme against active defensive aircraft in three-body engagement 认领 引用
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作者 Xintao WANG Tao CHAO +2 位作者 Mingzhe HOU Songyan WANG Ming YANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期530-545,共16页
This paper proposes a two-phase game guidance strategy for the three-body confrontation scenario according to the linear quadratic differential game method,which includes an Attacker,an Interceptor,and a Target.The in... This paper proposes a two-phase game guidance strategy for the three-body confrontation scenario according to the linear quadratic differential game method,which includes an Attacker,an Interceptor,and a Target.The interception probabilities between the Attacker and the Interceptor-Target team are estimated using the probability density function.The desired zero-effort miss distances associated with the interception probabilities for the three-body conflict are acquired by virtue of the gradient descent method.The game combat is divided into two phases by introducing the switching time.In Phase 1,a differential game strategy is developed to guide the zero-control miss distance between the Attacker and the Interceptor-Target into the desired position,which guarantees that the Attacker has the maximizing probability of intercepting the Target and the minimizing probability of being captured by the Interceptor.In Phase 2,a differential game guidance strategy is proposed to ensure that the Attacker evades the pursuit of the Interceptor and intercepts the Target at the preset impact angle.Finally,numerical simulation verifies the effectiveness of the two-stage game guidance strategy. 展开更多
关键词 Active defensive aircraft Differential game Guidance law Three-body engagement Two-phase guidance
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Investigation of Oil-air Two-Phase Flow Inside Angular Contact Ball Bearing with Textured Cage 认领 引用
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作者 WANG Baomin FANG Wenbo +1 位作者 YAN Ruixiang QIAN Sikai 《Journal of Shanghai Jiaotong university(Science)》 EI 2026年第2期528-536,共9页
Surface texture technology is a method to improve the tribological properties of friction pairs.In this study,a cylindrical texture is designed in cage pocket,and then the volume of fluid model and the multireference ... Surface texture technology is a method to improve the tribological properties of friction pairs.In this study,a cylindrical texture is designed in cage pocket,and then the volume of fluid model and the multireference frame method are used to investigate the oil volume fraction inside the bearing cavity,the pressure and oil distribution on the ball surface,and the oil distribution on the inner/outer raceway.The results show that the cylindrical texture in cage pocket is helpful to increase the oil volume fraction inside the bearing cavity,improve the pressure distribution on the ball surface,and increase the oil content on the ball surface.The cage pocket texture helps the ball to carry more lubrication oil in the high-speed rotation process,which increases the oil content of the outer raceway and improves the oil-air lubrication effect of the ball.This study proposes a new texture arrangement in cage pocket of angular contact ball bearings,and introduces the mixed mesh method to divide the fluid domain of bearing.Through comparative study,the cage pocket texture is helpful to improve the oil-air lubrication efficiency. 展开更多
关键词 angular contact ball bearing surface texture cage air-liquid two-phase flow
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Gas-solid two-phase flow erosion of needle throttle valve in shale gas field based on CFD-DEM model 认领 引用
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作者 Bing-Yuan Hong Zhe Wu +7 位作者 Yan-Bo Li Yu Meng Yue Su Wei-Dong Li Bai-Kang Zhu Xian-Lei Chen Wei-Qiang Wang Dai-Wei Liu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第5期2863-2884,共22页
Needle throttle valve(NTV)is a key equipment to ensure the safe production of shale gas fields,but it is often seriously eroded by the solid particles in the produced gas.At this work,the CFD-DEM coupling calculation ... Needle throttle valve(NTV)is a key equipment to ensure the safe production of shale gas fields,but it is often seriously eroded by the solid particles in the produced gas.At this work,the CFD-DEM coupling calculation method is adopted to investigate the internal flowfield characteristics and the erosion rate of each component of the NTV under gas-solid two-phase flow.The accuracy of the numerical model is validated by the comparison results of simulation and experiment.The results show that with the increase of particle diameter,the maximum erosion rate of each part of the valve generally increases.When valve opening degree(voD)is equal to 0.5,it has the best effect on suppressing erosion rates at high flow velocity.There is a"vulnerable zone"of the spool cone that is not affected by the changes in particle diameter and vOD,which occupies 2/3of the height of the spool cone.This work not only predicts the vulnerable zone of each component of the valve,but also reveals the erosion mechanism of the NTV,and can provide a reference for the design and maintenance of the valve. 展开更多
关键词 Shale gas field Needle throttle valve Gas-solid two-phase flow Particle flow erosion CFD-DEM coupling calculation
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Impact of roadside water on sloped subgrade stability along the Qingzang Railway with two-phase closed thermosyphon and crushed rock revetment 认领 引用
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作者 LI Yasheng WEN Zhi +1 位作者 ZHANG Mingli MA Wei 《Journal of Mountain Science》 SCIE CSCD 2026年第1期254-269,共16页
In permafrost regions of the QinghaiXizang Plateau,embankments of the Qinghai-Xizang Highway and Qinghai-Xizang Railway experiencing roadside water accumulation exhibit more pronounced engineering deteriorations.A wid... In permafrost regions of the QinghaiXizang Plateau,embankments of the Qinghai-Xizang Highway and Qinghai-Xizang Railway experiencing roadside water accumulation exhibit more pronounced engineering deteriorations.A widely accepted view is that the accumulated water adjacent to the embankment possesses substantial thermal energy,which accelerates the degradation-even disappearance-of the underlying permafrost.Moreover,the presence of roadside water keeps the embankment soil in a persistently high-moisture state,thereby making the frozen-soil embankment more susceptible to deformation under traffic loading.However,in the permafrost regions of the QinghaiXizang Plateau,deteriorations of embankments affected by roadside water are more commonly manifested as undulating pavement surfaces,and extensive crack networks appear on the embankment crest even where thermosyphons are installed.These manifestations are not fully consistent with the deterioration mechanisms proposed by existing viewpoints.We propose the hypothesis that temperature gradients,formed due to the freezing and thawing processes between the roadside wateraffected soil and the roadbed soil,lead to moisture migration under the influence of temperature gradients,resulting in frost heave and thaw settlement in the roadbed soil.To validate this hypothesis,we conducted the following investigations sequentially.Initially,we selected a roadbed with a thermosyphon(TPCT)system,which has a significant cooling effect,as the study object.By analyzing the temperature monitoring data of the roadbed section,the temperature variance was calculated to identify the time nodes where the temperature gradient of the roadbed soil was maximum and minimum.Subsequently,corresponding roadbed temperature distribution maps were drawn,illustrating the changes in the temperature and position of the lowtemperature core near the TPCT over time.Furthermore,using small-scale indoor model experiments,we qualitatively concluded that moisture in the soil migrates toward the TPCT due to the temperature gradient.Thereafter,combining borehole water content data and precipitation data from the sloped terrain construction site,the formation mechanisms and timing characteristics of roadside water accumulation were analyzed.Ultimately,by integrating the ground temperature data,air temperature data,roadside water formation mechanisms,and the operating characteristics of the TPCT,it was concluded that roadside water,while in a thawed state during TPCT operation,acts as a supplementary source for moisture migration in the roadbed soil.This migration leads to cracking in the TPCT roadbed.Therefore,this study reveals a novel damage mechanism:asynchronous freeze-thaw processes induce temperature gradients,which drive the migration of roadside water into the roadbed and are responsible for the cracking damage. 展开更多
关键词 Roadside water Low-temperature core Two-phase closed thermosyphon Temperature gradient Water migration Field test
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Aqueous two-phase high-viscosity friction reducer for deep reservoir fracturing and its mechanisms of temperature resistance and viscosity enhancement 认领 引用
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作者 YOU Qing DING Xingxing +4 位作者 LI Hanzhou HUANG Xiaokai JIN Zhirong DAI Caili TAO Jiaping 《Petroleum Exploration and Development》 SCIE 2026年第3期875-886,共12页
Given the stringent requirements for friction reducers in terms of long-distance friction reduction,efficient proppant transport,temperature resistance and viscosity enhancement in deep oil and gas reservoir fracturin... Given the stringent requirements for friction reducers in terms of long-distance friction reduction,efficient proppant transport,temperature resistance and viscosity enhancement in deep oil and gas reservoir fracturing development,an aqueous two-phase high-viscosity friction reducer ANsD-PADA suitable for deep reservoir fracturing was prepared by introducing nanomaterial ANsD and through the aqueous two-phase polymerization.Its mechanisms of temperature resistance,viscosity enhancement,and friction reduction were explored by means of fluorescence spectroscopy,microscopic morphology observation,nanomechanical testing and other analytical methods,and field tests were also carried out.The introduction of hydrophobic monomer N-(3-dimethylaminopropyl)methacrylamide enables PADA(a self-synthesized hydrophobic terpolymer)molecules to entangle,associate and self-assemble into a honeycomb-like network structure under the combined effects of van der Waals forces,electrostatic repulsion and hydrophobic interaction.This structure further increases the hydrodynamic volume,thereby significantly improving the viscosity-enhancing performance of the product.ANsD fills the pores of the polymer network structure,effectively strengthening the network skeleton and association junctions,and remarkably improving the temperature resistance of the system.The friction reducer retains a friction reduction rate of 73.36%at 130°C,with a temperature resistance up to 150°C,and it has demonstrated encouraging results in the pilot site at Well XX-HF targeting deep shale oil reservoirs on the northern slope zone of the Gaoyou Sag,Subei Basin,China. 展开更多
关键词 deep oil and gas fracturing nanomaterial aqueous two-phase high-viscosity friction reducer temperature resistance viscosity enhancement nanomechanics
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A THMC model for gas recovery from coal seams:Integrating binary gas-water adsorption and two-phase flow 认领 引用
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作者 Zhiyong Xiao Gang Wang +5 位作者 Jie Liu Huafeng Deng Yujing Jiang Feng Jiang Chengcheng Zheng Yinge Zhu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期2033-2058,共26页
Although extensive research has been conducted on CO2-enhanced coalbed methane(CO2-ECBM)recovery,most prior studies have focused on the impact of gas adsorption-induced swelling on coal permeability under equili... Although extensive research has been conducted on CO2-enhanced coalbed methane(CO2-ECBM)recovery,most prior studies have focused on the impact of gas adsorption-induced swelling on coal permeability under equilibrium conditions.This paper presents a comprehensive thermo-hydro-mechanical-chemical(THMC)model that integrates thermal expansion and heat conduction(T),gas diffusion in the matrix and gas-water two-phase flow in the fractures(H),matrix and fracture deformation due to poroelasticity(M),and non-equilibrium binary gas adsorption-induced matrix swelling(C)during CO2-ECBM recovery.The accuracy of the proposed model was verified through experimental data,and the model was simulated using finite element method(FEM)software.Simulation results indicate that the permeability evolution can be categorized into three stages.Ignoring the impact of water on gas adsorption properties would lead to an overestimation of the influence of adsorption-induced swelling,while disregarding non-equilibrium adsorption underestimates it.An examination of five designed cases identified critical factors influencing permeability.Parametric analysis shows that increases in the injection pressure,the injection temperature,and the initial permeability promote the competitive adsorption-induced swelling between CH4and CO2,leading to increased CH4production and CO2storage.Conversely,an increase in initial water saturation reduces available gas flow space,decreasing both CH4production and CO2storage.Higher irreducible water saturation favors early gas recovery,while lower irreducible water saturation is more advantageous for long-term recovery. 展开更多
关键词 CO2-Enhanced coalbed methane(CO2-ECBM) Binary gas adsorption Gas-water two-phase flow Non-equilibrium adsorption
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Thermodynamic performance calculation and test verification of gas-liquid two-phase water ramjet engine 认领 引用
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作者 Pingan LIU Dianlong SUN +4 位作者 Xile QIAN Shang LIU Tao WANG Jingtao CHENG Kejing XU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期1-17,共17页
Underwater gas-liquid two-phase propulsion technology is an emerging propulsion method that offers high efficiency and unrestricted navigation speed.The integration of this technology into water ramjet engines can sig... Underwater gas-liquid two-phase propulsion technology is an emerging propulsion method that offers high efficiency and unrestricted navigation speed.The integration of this technology into water ramjet engines can significantly enhance propulsion efficiency and holds substantial potential for broad applications.However,forming a gas-liquid two-phase flow within the nozzle requires introducing a large amount of rammed seawater.At this time,there is a complex phase transition problem of combustion products in the combustion chamber,which makes the thermodynamic calculation for gas-liquid two-phase water ramjet engines particularly challenging.This paper proposes a thermodynamic calculation method for gas-liquid two-phase water ramjet engines,based on the energy equation for gas-liquid two-phase flow and traditional thermodynamic principles,enabling thermodynamic calculations under conditions of ultra-high water-fuel ratios.Additionally,ground ignition tests of the gas-liquid two-phase engine were conducted,yielding critical engine test parameters.The results demonstrate that the gas-liquid two-phase water ramjet engine achieves a high specific impulse,with a theoretical maximum specific impulse of up to 7000(N s)/kg.The multiphase flow effects significantly impact engine performance,with specific impulse losses reaching up to 25.86%.The error between the thrust and specific impulse in the ground test and the theoretical values is within 10%,validating the proposed thermodynamic calculation method as a reliable reference for further research on gas-liquid two-phase water ramjet engines. 展开更多
关键词 Gas-liquid two-phase flow Ignition test Multiphase flow Thermal calculation Water ramjet engine
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Liquid–liquid two-phase flow and droplet formation in a T-junction microchannel 认领 引用
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作者 Nerisha Tuladhar Muhammad Rafay Shahzad +2 位作者 Zien Huang Sandeep Dhital Taotao Fu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第1期25-35,共11页
This study investigates the droplet formation for the liquid–liquid two-phase flow within a square T-junction microchannel through numerical simulation using volume of fluid method and experimental visualization usin... This study investigates the droplet formation for the liquid–liquid two-phase flow within a square T-junction microchannel through numerical simulation using volume of fluid method and experimental visualization using high-speed camera imaging.The T-junction microchannel has a cross-sectional width of 0.6 mm and a total length of 27.3 mm.The solution of cyclohexane with 2%and 3%mass concentrations of sorbitan trioleate surfactant were used as the continuous phase,and water was used as the dispersed phase.Slug flow,characteristic of squeezing regime,were predominantly observed.The effects of liquid–liquid two-phase flow rate ratio,and dimensionless number on droplet size,and pressure drop were investigated.The squeezing regime was mapped for 0.0005≤Cac≤0.0052(capillary number)and 0.1≤q≤10(flow rate ratio).The pressure drops of slugs were in the range from 40 Pa to 200 Pa.The slug lengths were measured between 1 mm and 9 mm.A universal flow map dependent on CacRed0.5 are projected to investigate the droplet formation behavior in T-junction microchannel.Correlation expressions are proposed to predict pressure drops and the slug lengths for liquid–liquid two-phase flow in a square T-junction microchannel,using dimensionless numbers such as flow rate ratio and capillary number.The result shows that large continuous phase flow rates facilitate smaller slugs,whereas higher dispersed phase flow rates result in longer shorts. 展开更多
关键词 Droplet formation Interfacial phenomena Liquid–liquid two-phase flow T-junction microchannel
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Aqueous two-phase system as a greener extraction method and the synergistic effects of the herbal mixture for acne-prone skin cosmetic applications 认领 引用
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作者 Minh Hien Nguyen Minh-Tri Le +2 位作者 Khac-Minh Thai Soo-Yeon Lee Jin-Han Park 《Journal of Dermatologic Science and Cosmetic Technology》 2026年第2期71-82,共12页
Background:Acne-prone skin requires long-term,user-friendly cosmetic approaches that can address oxidative stress,microbial imbalance,and biofilm formation without solely relying on antibiotics.Objective:This study ev... Background:Acne-prone skin requires long-term,user-friendly cosmetic approaches that can address oxidative stress,microbial imbalance,and biofilm formation without solely relying on antibiotics.Objective:This study evaluated whether an ethanol/(NH4)2SO4aqueous two-phase system(ATPS)could serve as a greener,polarity-directed extraction method for a four-herb mixture(Houttuynia cordata,Scutellaria baicalensis,Chamaecyparis obtusa,and Artemisia capillaris)and examined whether the resulting fractions were suitable for downstream cosmetic development.Materials and Methods:ATPS fractions prepared with 35%ethanol and 10%,12%,or 14%ammonium sulfate(N10,N12,and N14)were compared with the crude extract using TLC profiling,total phenolic content(TPC),total flavonoid content(TFC),total triterpenoid content(TTC),and DPPH radical-scavenging assays.Biological relevance was further assessed using zebrafish toxicity and H2O2-induced oxidative-stress models with qPCR analysis of antioxidant-related genes.Because the crude extract showed a more favorable in vivo safety profile than the ATPS fractions,prototype cleanser and spot gel serum formulations were developed using the crude extract rather than the ATPS fractions and were evaluated for short-term physicochemical stability,antibacterial activity,and antibiofilm formation against Cutibacterium acnes and Staphylococcus epidermidis.Results:ATPS selectively enriched phenolic and flavonoid constituents while reducing triterpenoid content,with N12 showing the highest TPC(690.8 mg GAE/g)and TFC(42.6 mg QE/g)and strong DPPH scavenging(IC5010.67μg/mL),markedly improved over the crude extract(IC5050.18μg/mL).However,zebrafish assays favored the crude extract,which showed better tolerance at higher exposure and clearer protection under oxidative stress,with modest upregulation of prdx1(∼1.44-fold)at 50μg/mL.Both crude extract-based prototypes remained physically stable over 4 weeks,while the cleanser showed clear antibacterial activity and near-complete suppression of mono-and mixed-species biofilms.Conclusion:Although ATPS improved chemical antioxidant enrichment,the crude extract was safer and more suitable for prototype development,and the crude extract-based cleanser emerged as the most promising formulation for repeated,user-friendly application to acne-prone skin. 展开更多
关键词 Aqueous two-phase system Acne-prone skin Herbal extract Topical formulation
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Two-phase pairwise comparison-based model for the ranking prediction of global innovation capability 认领 引用
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作者 CUI Ruijing SUN Jianbin YANG Kewei 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2026年第2期504-520,共17页
To predict the ranking of the country’s innovation capability in the world in real-time,this study designs a twophased prediction model based on the pairwise comparison.Data from the global innovation index(GII)repor... To predict the ranking of the country’s innovation capability in the world in real-time,this study designs a twophased prediction model based on the pairwise comparison.Data from the global innovation index(GII)reports are employed in this study.Countries with different income levels have shown different development inertias,the two-phased prediction model is thus proposed.In the first phase,the GII data from the previous year are applied to predict the ranking of innovation capability for high-income countries.In the second phase,more years of historical data are adopted to predict the innovation ranking for other countries.The global innovation rankings for all countries and economies are thus obtained.Experiments have proved that the model requires only a few indicators to get accurate results.The model provides real-time decision support for decision-makers to formulate innovative development policies. 展开更多
关键词 global innovation index(GII) pairwise comparison ranking prediction two-phased model
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Bi-Objective Optimization of a Repairable M/M/(1+c)Queueing System with Two-Phase Service and Redundant Dependencies 认领 引用
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作者 XU Fan TIAN Ruiling SHAO Qi 《应用概率统计》 CSCD 北大核心 2026年第3期317-335,共19页
In this paper,we consider a repairable M/M/(1+c)queueing system with two-phase service and redundant dependencies,in which the second phase of service is provided by c identical servers,which randomly provide two type... In this paper,we consider a repairable M/M/(1+c)queueing system with two-phase service and redundant dependencies,in which the second phase of service is provided by c identical servers,which randomly provide two types of services to customers.The customers who enter the system are divided into Type 1 customers and Type 2 customers.If the waiting room of the second phase is not fully occupied,Type 2 customers can directly enter the second phase.In practice,there are various dependencies among the failure behaviors of the servers,which are called failure dependencies.We present a redundancy function to determine the failure rate of servers.We first derive the steady-state probabilities and performance measures of the system by quasi-birth-and-death(QBD)process theory and matrix-geometric solution method.Next,we provide numerical examples to illustrate the effects of four types of redundant dependencies on performance measures.Then,we construct a bi-objective optimal model and provide a scoring method that makes it possible to achieve an appropriate balance between the system cost and the service quality.Finally,the regression equation between the minimum cost and the waiting time is proposed,which is helpful to determine the minimum cost that meets the service quality. 展开更多
关键词 bi-objective optimization redundant dependency two-phase service QBD process repairable system
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Dual-scale insights of two-phase flow in inter-cleats based on microfluidics:Interface jumps and energy dissipation 认领 引用 被引量：2
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作者 Jicheng Zhang Dawei Lv +3 位作者 Jon Jincai Zhang Feng Wang Dawei Yin Haiyang Yu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第3期451-465,共15页
Cleat serves as the primary flow pathway for coalbed methane(CBM)and water.However,few studies consider the impact of local contact on two-phase flow within cleats.A visual generalized model of endogenous cleats was c... Cleat serves as the primary flow pathway for coalbed methane(CBM)and water.However,few studies consider the impact of local contact on two-phase flow within cleats.A visual generalized model of endogenous cleats was constructed based on microfluidics.A microscopic and mesoscopic observation technique was proposed to simultaneously capture gas-liquid interface morphology of pores and throat and the two-phase flow characteristics in entire cleat system.The local contact characteristics of cleats reduced absolute permeability,which resulted in a sharp increase in the starting pressure.The reduced gas flow capacity narrowed the co-infiltration area and decreased water saturation at the isotonic point in a hydrophilic environment.The increased local contact area of cleats weakened gas phase flow capacity and narrowed the co-infiltration area.Jumping events occurred in methane-water flow due to altered porosity caused by local contact in cleats.The distribution of residual phases changed the jumping direction on the micro-scale as well as the dominant channel on the mesoscale.Besides,jumping events caused additional energy dissipation,which was ignored in traditional two-phase flow models.This might contribute to the overestimation of relative permeability.The work provides new methods and insights for investigating unsaturated flow in complex porous media. 展开更多
关键词 Inter-cleat Microfluidics Two-phase flow Dual-scale Interface jump Inertial effect
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Efficient prediction of gaseous n-hexane removal in two-phase partitioning bioreactors with silicone oil based on the mechanism and kinetic models 认领 引用 被引量：2
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作者 Lichao Lu Tuo Ju +6 位作者 Yangdan Fang Jingtao Hu Zhuqiu Sun Zhuowei Cheng Qian Li Jianmeng Chen Dong-zhi Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第8期729-740,共12页
Two-phase partitioning bioreactors(TPPBs)have been widely used because they overcome the mass-transfer limitation of hydrophobic volatile organic compounds(VOCs)in waste gas biological treatments.Understanding the mec... Two-phase partitioning bioreactors(TPPBs)have been widely used because they overcome the mass-transfer limitation of hydrophobic volatile organic compounds(VOCs)in waste gas biological treatments.Understanding the mechanisms of mass-transfer enhancement in TPPBs would enable efficient predictions for further industrial applications.In this study,influences of gradually increasing silicone oil ratio on the TPPB was explored,and a 94.35%reduction of the n-hexane partition coefficient was observed with 0.1 vol.%silicone,which increased to 80.7%along with a 40-fold removal efficiency enhancement in the stabilised removal period.The elimination capacity increased from 1.47 to 148.35 g/(m3·h),i.e.a 101-fold increase compared with that of the single-phase reactors,when 10 vol.%(3 Critical Micelle Concentration)silicone oil was added.The significantly promoted partition coefficient was the main reason for the mass transfer enhancement,which covered the negative influences of the decreased total mass-transfer coefficient with increasing silicone oil volume ratio.The gradually rising stirring rate was benefit to the n-hexane removal,which became negative when the dominant resistance shifted from mass transfer to biodegradation.Moreover,a mass-transfer-reaction kinetic model of the TPPB was constructed based on the balance of n-hexane concentration,dissolved oxygen and biomass.Similar to the mechanism,the partition factor was predicted sensitive to the removal performance,and another five sensitive parameters were found simultaneously.This forecasting method enables the optimisation of TPPB performance and provides theoretical support for hydrophobic VOCs degradation. 展开更多
关键词 Mass transfer N-hexane Two-phase partitioning bioreactors Silicone oil
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The migration and deposition patterns of coal fines and their initiation mechanisms during the gas-water two-phase flow stage in coalbed methane wells 认领 引用 被引量：3
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作者 Wei Li Jian Shen +3 位作者 Zhuang Ma Wujie Pan Qian Wang Chao Li 《International Journal of Coal Science & Technology》 SCIE EI CAS CSCD 2025年第6期64-82,共19页
The deposition of coal fines in fractures reduces fracture conductivity and hampers efficient coalbed methane production.The results of the multiphase flow visualization experiment indicate that,at low flow rates,fine... The deposition of coal fines in fractures reduces fracture conductivity and hampers efficient coalbed methane production.The results of the multiphase flow visualization experiment indicate that,at low flow rates,fines primarily deposit at the bottom of fracture.At medium flow rates,they exhibit finger-like migration patterns.At high flow rates,some fines initially transported out,but later they tend to form agglomerates.Fine coal fines migrate through suspension and rolling,while medium coal fines form filter cakes both inside and outside the fractures,and coarse coal fines block gas-water flow by forming filter cakes at the fracture fronts.Smaller particle sizes result in higher fines production.The output of coal fines peaks at concentration 4%before declining.Higher concentrations promote the formation of filter cake;however,gas-water injection can effectively clear these blockages.Multiple forces drive fines migration,with capillary forces playing a significant role in this process.The initiation velocity decreases with increasing particle size,but it rises again at a particle size threshold of 22μm.In the early stages,fines are more influenced by adhesion forces,but gravity prevails as particle size grows.At flow rates between 0.2 and 0.29 cm/s,fines ranging from 0.4 to 52.44μm are discharged from the coal seam.The results provide insights into coalbed methane production during gas-water flow. 展开更多
关键词 Coalbed methane Coal fines migration Gas-water two-phase flow Visualization experiment Dynamic mechanism Critical velocity
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Pore-scale gas–water two-phase flow and relative permeability characteristics of disassociated hydrate reservoir 认领 引用 被引量：2
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作者 Yu-Xuan Xia Derek Elsworth +3 位作者 Sai Xu Xuan-Zhe Xia Jian-Chao Cai Cheng Lu 《Petroleum Science》 SCIE EI CAS CSCD 2025年第8期3344-3356,共13页
Clayey-silt natural gas hydrate reservoirs in the South China Sea exhibit loose and unconsolidated structures, heterogeneous pore structures, high clay mineral contents, and strong hydrophilicity. These characteristic... Clayey-silt natural gas hydrate reservoirs in the South China Sea exhibit loose and unconsolidated structures, heterogeneous pore structures, high clay mineral contents, and strong hydrophilicity. These characteristics complicate the gas-water two-phase flow process in porous media following hydrate decomposition, posing challenges for efficient development. This study examines the transport response of clayey-silt reservoir samples from the Shenhu area using gas-water two-phase flow experiments and CT scanning to explore changes in pore structure, gas-water distribution, and relative permeability under varying flow conditions. The results indicate that pore heterogeneity significantly influences flow characteristics. Gas preferentially displaces water in larger pores, forming fracture-like pores, which serve as preferential flow channels for gas migration. The preferential flow channels enhance gas-phase permeability up to 19 times that of the water phase when fluid pressures exceed total stresses. However,small pores retain liquid, leading to a high residual water saturation of 0.561. CT imaging reveals that these hydro-fractures improve gas permeability but also confine gas flow to specific channels. Pore network analysis shows that gas injection expands the pore-throat network, enhancing connectivity and forming fracture-like pores. Residual water remains trapped in smaller pores and throats, while structural changes, including new fractures, improve gas flow pathways and overall connectivity. Relative permeability curves demonstrate a narrow gas-water cocurrent-flow zone, a right-shifted iso-permeability point and high reservoir capillary pressure, indicating a strong "water-blocking" effect. The findings suggest that optimizing reservoir stimulation techniques to enhance fracture formation, reduce residual water saturation, and improve gas flow capacity is critical for efficient hydrate reservoir development. 展开更多
关键词 Clayey-silt reservoir Gasewater two-phase flow CT scanning Relative permeability Pore network model
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Sparse pipeline wall information-based data-driven reconstruction for solid–liquid two-phase flow in flexible vibrating pipelines 认领 引用 被引量：1
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作者 Shengpeng Xiao Chuyi Wan +6 位作者 Hongbo Zhu Dai Zhou Juxi Hu Mengmeng Zhang Yuankun Sun Yan Bao Ke Zhao 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第11期1885-1903,共19页
Deep-sea mineral resource transportation predominantly utilizes hydraulic pipeline methodology.Environmental factors induce vibrations in flexible pipelines,thereby affecting the internal flow characteristics.Therefor... Deep-sea mineral resource transportation predominantly utilizes hydraulic pipeline methodology.Environmental factors induce vibrations in flexible pipelines,thereby affecting the internal flow characteristics.Therefore,real-time monitoring of solid–liquid two-phase flow in pipelines is crucial for system maintenance.This study develops an autoencoder-based deep learning framework to reconstruct three-dimensional solid–liquid two-phase flow within flexible vibrating pipelines utilizing sparse wall information from sensors.Within this framework,separate X-model and F-model with distinct hidden-layer structures are established to reconstruct the coordinates and flow field information on the computational domain grid of the pipeline under traveling wave vibration.Following hyperparameter optimization,the models achieved high reconstruction accuracy,demonstrating R2values of 0.990 and 0.945,respectively.The models’robustness is evaluated across three aspects:vibration parameters,physical fields,and vibration modes,demonstrating good reconstruction performance.Results concerning sensors show that 20 sensors(0.06%of total grids)achieve a balance between accuracy and cost,with superior accuracy obtained when arranged along the full length of the pipe compared to a dense arrangement at the front end.The models exhibited a signal-to-noise ratio tolerance of approximately 27 dB,with reconstruction accuracy being more affected by sensor failures at both ends of the pipeline. 展开更多
关键词 Particles Solid-liquid two-phase flow Vibration Flexible pipelines Deep learning Reconstruction
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Dynamic Behavior of a Pipe Conveying a Gas-Liquid Two-Phase Flow Under External Excitations 认领 引用 被引量：1
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作者 FU Guang-ming WANG Xiao +4 位作者 JIAO Hui-lin WANG Bo-ying SHAN Zheng-feng SUN Bao-jiang SU Jian 《China Ocean Engineering》 SCIE EI CSCD 2025年第5期822-838,共17页
This work investigated the dynamic behavior of vertical pipes conveying gas-liquid two-phase flow when subjected to external excitations at both ends.Even with minimal excitation amplitude,resonance can occur when the... This work investigated the dynamic behavior of vertical pipes conveying gas-liquid two-phase flow when subjected to external excitations at both ends.Even with minimal excitation amplitude,resonance can occur when the excitation frequency aligns with the natural frequency of the pipe,significantly increasing the degree of operational risk.The governing equation of motion based on the Euler-Bernoulli beam is derived for the relative deflection with stationary simply supported ends,with the effects of the external excitations represented by source terms distributed along the pipe length.The fourth-order partial differential equation is solved via the generalized integral transform technique(GITT),with the solution successfully verified via comparison with results in the literature.A comprehensive analysis of the vibration phenomena and changes in the motion state of the pipe is conducted for three classes of external excitation conditions:same frequency and amplitude(SFSA),same frequency but different amplitudes(SFDA),and different frequencies and amplitudes(DFDA).The numerical results show that with increasing gas volume fraction,the position corresponding to the maximum vibration displacement shifts upward.Compared with conditions without external excitation,the vibration displacement of the pipe conveying two-phase flow under external excitation increases significantly.The frequency of external excitation has a significant effect on the dynamic behavior of a pipe conveying two-phase flow. 展开更多
关键词 pipe conveying fluid integral transform two-phase flow external excitations dynamic response forced vibrations
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