期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到143篇文章
< 1 2 … 8 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Second-Law Analysis of Double Diffusive Convection of Casson Ternary Nanofluid in a Porous Enclosure with a T-Shaped Baffle 认领 引用
1
作者 Sarna Soren Samrat Hansda +3 位作者 Umair Khan Anuar Ishak Ahmed Kadhim Hussein Md Mamun Molla 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第5期793-827,共35页
This study presents a numerical investigation of thermosolutal convection within a baffled porous cavity filled with a radiative Casson-based ternary aqueous nanofluid.The ternary hybrid nanofluid is formulated by dis... This study presents a numerical investigation of thermosolutal convection within a baffled porous cavity filled with a radiative Casson-based ternary aqueous nanofluid.The ternary hybrid nanofluid is formulated by dispersing three distinct nanoparticles into a water-based solution,aiming to enhance the thermal and solute transport characteristics.The cavity includes internal baffles that modulate convective flow and facilitate improved energy transport.The governing equations for momentum,energy,species concentration,and entropy generation are discretized and solved using a higher-order compact(HOC)finite difference scheme,ensuring superior numerical precision.The novelty of the present study lies in the irreversibility analysis of thermosolutal convection of a Casson ternary nanofluid in a porous wavy enclosure with a T-shaped baffle,highlighting the combined effects of nonNewtonian behavior,ternary nanoparticle interaction,and geometric modification on entropy generation and transport performance.The impacts of key physical parameters on solutal and thermal distributions,entropy generation,and the Bejan number are systematically examined.The study reveals that the combined influence of the non-Newtonian nature of the Casson fluid and thermal radiation significantly alters flow structure and transport rates.Enhanced heat transfer is observed with increasing radiation parameters,while solutal transport remains relatively less sensitive.The presence of internal baffles promotes localized vortices and thermal layering,contributing to complex thermo-solutal interactions.The outcomes also show that the inclusion of a T-shaped baffle within the container enhances overall convective transport characteristics and system performance.The findings provide valuable insights into the design of advanced energy systems involving non-Newtonian nanofluids in porous enclosures under radiative and geometric constraints. 展开更多
关键词 Thermosolutal convection T-shaped baffle Casson fluid ternary hybrid nanofluid entropy generation thermal radiation wavy enclosure
暂未订购 下载PDF
Structural Design Optimization of the Turbine Baffle Based on the Slime Mould Algorithm of Zhizhou Software 认领 引用
2
作者 PEI Ben LIU Yiyuan +4 位作者 CHEN Yalong TENG Da HOU Naixian MI Dong YAN Cheng 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2026年第3期412-426,共15页
As a critical component of the turbine rotor,the baffle plays an essential role in ensuring safe and reliable operation of the aero-engine.This study addresses the issue of excessive local stress in the baffle of a hi... As a critical component of the turbine rotor,the baffle plays an essential role in ensuring safe and reliable operation of the aero-engine.This study addresses the issue of excessive local stress in the baffle of a high-pressure turbine disc.The structural design optimization is performed using the self-developed Zhizhou software integrated with the slime mould algorithm(SMA).Leveraging advanced algorithms and comprehensive simulation interfaces,the Zhizhou software effectively exploits the potential of structural design,leading to significant improvements in structural performance.The SMA algorithm employs a positive feedback mechanism and adaptive strategies through the incorporation of fitness weights and oscillation factors.These parameters simulate the oscillatory contraction behavior of slime moulds,allowing the algorithm to dynamically adjust search direction and speed,thereby achieving an effective balance between local exploration and global optimization.During the optimization process,a sector submodel is established,and the contact model is simplified using a force load equivalence approach to improve computational efficiency.Subsequently,a parametric model of the baffle is developed based on geometric characteristics,stress responses,and boundary constraints,with the variation ranges of key parameters being determined.A mathematical model is then formulated with the objective of minimizing the maximum equivalent stress,under the constraint of the axial support reaction force at the contact surface.Finally,an integrated design optimization workflow is constructed using Zhizhou in combination with Unigraphics(UG)and Workbenchs,as well as incorporating the SMA algorithm to optimize the baffle structure.After optimization,the maximum equivalent stress is decreased from 1382.4 to 1235.4 MPa,a reduction of 10.6%.Meanwhile,the axial support reaction force is increased from 4158.9 to 4330.6 N,a variation of 4.0%,which satisfies the requirement for being within 12%.These results validate the effectiveness of the SMA algorithm in the structural design optimization of the baffle and demonstrate the practical value of the Zhizhou software in engineering applications. 展开更多
关键词 high-pressure turbine baffle Zhizhou software slime mould algorithm(SMA) structural optimization
暂未订购 下载PDF
Comparison of heat transfer performances of helix baffled heat exchangers with different baffle configurations 认领 引用 被引量：6
3
作者 董聪 陈亚平 吴嘉峰 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第1期255-261,共7页
Numerical simulations were performed on flow and heat transfer performances of heat exchangers having six helical baffles of different baffle shapes and assembly configurations, i.e., two trisection baffle schemes, tw... Numerical simulations were performed on flow and heat transfer performances of heat exchangers having six helical baffles of different baffle shapes and assembly configurations, i.e., two trisection baffle schemes, two quadrant baffle schemes, and two continuous helical baffle schemes. The temperature contour or the pressure contour and velocity contour plots with superimposed velocity vectors on meridian, transverse and unfolded concentric hexagonal slices are presented to obtain a full angular view. For the six helix baffled heat exchangers,the different patterns of the single vortex secondary flow and the shortcut leakage flow were depicted as well as the heat transfer properties were compared. The results show that the optimum scheme among the six configurations is a circumferential overlap trisection helix baffled heat exchanger with a baffle incline angle of 20°(20°TCO) scheme with an anti-shortcut baffle structure, which exhibits the second highest pressure dropΔpo, the highest overall heat transfer coefficient K, shell-side heat transfer coefficient hoand shell-side average comprehensive index ho/Δpo. 展开更多
关键词 Helix baffled heat exchanger Trisection baffle Quadrant baffle Continuous baffle Circumferential overlap baffle Secondary flow Heat transfer Numerical simulation
暂未订购 下载PDF
Impacts and depositional behaviors of debris flows on natural boulder-negative Poisson's ratio anchor cable baffles 认领 引用 被引量：1
4
作者 Feifei Zhao Manchao He +1 位作者 Qiru Sui Zhigang Tao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第2期946-959,共14页
The impacts of natural boulders carried by debris flows pose serious risks to the safety and reliability of structures and buildings.Natural boulders can be highly random and unpredictable.Consequently,boulder control... The impacts of natural boulders carried by debris flows pose serious risks to the safety and reliability of structures and buildings.Natural boulders can be highly random and unpredictable.Consequently,boulder control during debris flows is crucial but difficult.Herein,an eco-friendly control system featuring anchoring natural boulders(NBs)with(negative Poisson's ratio)NPR anchor cables is proposed to form an NB-NPR baffle.A series of flume experiments are conducted to verify the effect of NB-NPR baffles on controlling debris flow impact.The deployment of NB-NPR baffles substantially influences the kinematic behavior of a debris flow,primarily in the form of changes in the depositional properties and impact intensities.The results show that the NB-NPR baffle matrix successfully controls boulder mobility and exhibits positive feedback on solid particle deposition.The NB-NPR baffle group exhibits a reduction in peak impact force ranging from 29%to 79%compared to that of the control group in the basic experiment.The NPR anchor cables play a significant role in the NB-NPR baffle by demonstrating particular characteristics,including consistent resistance,large deformation,and substantial energy absorption.The NB-NPR baffle innovatively utilizes the natural boulders in a debris flow gully by converting destructive boulders into constructive boulders.Overall,this research serves as a basis for future field experiments and applications. 展开更多
关键词 Debris flow Natural boulders NPR anchor cable Baffle Depositional behavior Impact
暂未订购 下载PDF
Research on Transport and Mixing Dynamics of Valveless Piezoelectric Pump with Airfoil Baffles 认领 引用 被引量：1
5
作者 XIONG Jian KUANG Ming +3 位作者 WANG Lu AFFANE Hiba HUANG Yadong HUANG Jun 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2025年第2期238-249,共12页
To reduce the complexity of mixing systems and improve mixing efficiency,this paper proposes a valveless piezoelectric pump integrated with airfoil baffles,which embodies both active and passive mixing attributes.The ... To reduce the complexity of mixing systems and improve mixing efficiency,this paper proposes a valveless piezoelectric pump integrated with airfoil baffles,which embodies both active and passive mixing attributes.The airfoil baffles are designed using the asymmetric NACA63-412 profile.The impact of the airfoil angle of attack on the flow field within the tube and the output and mixing performance of the piezoelectric pump is investigated.Computational simulations of the tube with airfoil baffle indicated that as the angle of attack increases,the position of vortex generation at the leading and trailing edge regions of the airfoil baffle progressively moves forward in the direction of fluid flow.Then the vortex volume enlarges,and the vortex intensity within the flow field rises.Subsequently,the prototypes of valveless piezoelectric pumps at four different angles of attack are fabricated and their output performances are experimentally evaluated.The results demonstrate that the maximum output flow rate of the pump decreases with an increasing angle of attack.At an angle of attack of 0°,the maximum output flow rate of the pump reaches 225.3 ml/min.Mixing performance experiments are conducted using the piezoelectric pump for the synthesis of Fe3O4particles.The findings indicate that as the angle of attack increases,the number of Fe3O4particles formed in the mixture significantly rises,with a narrower particle size distribution and more regular morphology.At an angle of attack of 15°,the synthesized Fe3O4particles have an approximate diameter of 10μm.The outcomes of this paper offer valuable insights for the design of microfluidic systems,catering to the demands of material synthesis,chemistry,and biomedical applications. 展开更多
关键词 micro mixer airfoil baffle piezoelectric pump vortex Fe3O4particles
暂未订购 下载PDF
Performance comparison for oil-water heat transfer of circumferential overlap trisection helical baffle heat exchanger 认领 引用 被引量：2
6
作者 王伟晗 程道来 +1 位作者 刘涛 刘颖昊 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第10期2720-2727,共8页
The performance tests were conducted on oil–water heat transfer in circumferential overlap trisection helical baffle heat exchangers with incline angles of 12°, 16°, 20°, 24° and 28°, and com... The performance tests were conducted on oil–water heat transfer in circumferential overlap trisection helical baffle heat exchangers with incline angles of 12°, 16°, 20°, 24° and 28°, and compared with a segmental baffle heat exchanger. The results show that the shell side heat transfer coefficient h_o and pressure drop Δp_o both increase while the comprehensive index h_o/Δp_o decreases with the increase of the mass flow rate of all schemes. And the shell side heat transfer coefficient, pressure drop and the comprehensive index ho/Δpo decrease with the increase of the baffle incline angle at a certain mass flow rate. The average values of shell side heat transfer coefficient and the comprehensive index h_o/Δp_o of the 12° helical baffled scheme are above 50% higher than those of the segmental one correspondingly, while the pressure drop value is very close and the ratios of the average values are about 1.664 and 1.596, respectively. The shell-side Nusselt number Nu_o and the comprehensive index Nu_o·Euzo-1 increase with the increase of Reynolds number of the shell side axial in all schemes, and the results also demonstrate that the small incline angled helical scheme has better comprehensive performance. 展开更多
关键词 performance experiments helical baffled heat exchangers circumferential overlap of baffles incline angle of baffle heat transfer enhancement
暂未订购 下载PDF
Performance comparison of heat exchangers using sextant/trisection helical baffles and segmental ones 认领 引用 被引量：6
7
作者 Yaping Chen Hongling Tang +2 位作者 JiafengWu Huaduo Gu Shifan Yang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第12期2892-2899,共8页
The shell side flow fields of both sextant and trisection helical baffle heat exchangers are presented on meridian and multilayer hexagon slices.It verifies that the performance of sextant schemes is better than those... The shell side flow fields of both sextant and trisection helical baffle heat exchangers are presented on meridian and multilayer hexagon slices.It verifies that the performance of sextant schemes is better than those of the other kinds of helical baffle heat exchangers.The main mechanisms are due to the restricted leakage flow in the minimized gaps with increased baffle number and by one row of tubes dampen the leakage flow in the circumferential overlapped area of the adjacent helical baffles.The performance features were simulated on two different angled sextant helical heat exchangers and each compared with two trisection ones of either identical helical pitch or identical incline angle.The results verified that the performances of helical heat exchangers are mainly determined by the helical pitch rather than the baffle incline angle.The average values of comprehensive index hoΔpo-1/3 of the trisection helical schemes T-24.1°and T-29.7°are correspondingly 3.47%and 3.34%lower than those of the sextant ones X-20°and X-25°with identical helical pitches.The comparison results show that the average values of shell side h.t.c.hoand comprehensive index hoΔpo-1/3 of the optimal dual helix sextant scheme DX30°are respectively 7.22%and 23.56%higher than those of the segment scheme S100. 展开更多
关键词 Heat transfer Computational fluid dynamics Convection Helical baffle heat exchangers Sextant helical baffles
暂未订购 下载PDF
Effects of Perforated Baffle on Reducing Sloshing in Rectangular Tank:Experimental and Numerical Study 认领 引用 被引量：17
8
作者 薛米安 林鹏智 +3 位作者 郑金海 马玉祥 苑晓丽 Viet-Thanh NGUYENa 《China Ocean Engineering》 SCIE EI CSCD 2013年第5期615-628,共14页
A liquid sloshing experimental rig driven by a wave-maker is designed and built to study liquid sloshing problems in a rectangular liquid tank with perforated baffle. A series of experiments are conducted in this expe... A liquid sloshing experimental rig driven by a wave-maker is designed and built to study liquid sloshing problems in a rectangular liquid tank with perforated baffle. A series of experiments are conducted in this experimental rig to estimate the free surface fluctuation and pressure distribution by changing external excitation frequency of the shaking table. An in-house CFD code is also used in this study to simulate the liquid sloshing in three-dimensional （3D） rectangular tank with perforated baffle. Good agreements of free surface elevation and pressure between the numerical results and the experimental data are obtained and presented. Spectral analysis of the time history of free surface elevation is conducted by using the fast Fourier transformation. 展开更多
关键词 liquid sloshing experimental study rectangular tank perforated baffle
暂未订购 下载PDF
Drawdown mechanism of light particles in baffled stirred tank for the KR desulphurization process 认领 引用 被引量：12
9
作者 Meng Li Yangbo Tan +2 位作者 Jianglong Sun De Xie Zeng Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第2期247-256,共10页
To improve the efficiency of the desulfurization process, the drawdown mechanism of light particles in stirred tank is studied in this paper. For both up and down pumping modes, the just drawdown speeds(Njd) of floati... To improve the efficiency of the desulfurization process, the drawdown mechanism of light particles in stirred tank is studied in this paper. For both up and down pumping modes, the just drawdown speeds(Njd) of floating particles in transformative Kanbara Reactor(KR) are measured in one and four baffled stirred tanks experimentally. Then numerical simulations with standard k-ε model coupled with volume of fluid model(VOF) and discrete phase model(DPM) are conducted to analyze the flow field at the just drawdown speed Njd. The torques on the impeller obtained from experiments and simulations agree well with each other, which indicates the validity of our numerical simulations. Based on the simulations, three main drawdown mechanisms for floating particles, the axial circulation, turbulent fluctuation and largescale eddies, are analyzed. It's found that the axial circulation dominates the drawdown process at small submergence(S = 1/4 T and 1/3 T) and the large-scale eddies play a major role at large submergence(S = 2/3 T and 3/4 T). Besides, the turbulent fluctuation affects the drawdown process significantly for up pumping mode at small submergence(S = 1/4 T and 1/3 T) and for down pumping mode at large submergence(S = 2/3 T and 3/4 T). This paper helps to provide a more comprehensive understanding of the KR desulphurizer drawdown process in the baffled stirred tank. 展开更多
关键词 Light particles Drawdown mechanism Baffled stirred tank Submergence Numerical simulations KR impeller
暂未订购 下载PDF
Effects of operational factors on soluble microbial products in a carrier anaerobic baffled reactor treating dilute wastewater 认领 引用 被引量：13
10
作者 FENG Huajun HU Lifang +3 位作者 SHAN Dan FANG Chengran HE Yonghua SHEN Dongsheng 《Journal of Environmental Sciences》 SCIE EI CAS 2008年第6期690-695,共6页
The effects of feed strength, hydraulic residence time （HRT）, and operational temperatures on soluble microbial product （SMP） production were investigated, to gain insights into the production mechanism. A carrier... The effects of feed strength, hydraulic residence time （HRT）, and operational temperatures on soluble microbial product （SMP） production were investigated, to gain insights into the production mechanism. A carrier anaerobic baffled reactor （CABR） treating dilute wastewater was operated under a wide range of operational conditions, namely, feed strengths of 300-600 mg/L, HRTs of 9- 18 h, and temperatures of 10-28℃. Generally, SMP production increased with increasing feed strength and decreasing temperature. At high temperature （28℃）, SMP production increased with decreasing HRT. As the temperature was decreased to 18 and 10℃, the SMP production was at its peak for 12 h HRT. Therefore, temperature could be an important determinant of SMP production along with HRT. A higher SMP to soluble chemical oxygen demand （SCOD） ratio was found at high temperature and long HRT because of complete volatile fatty acid degradation. SMP accounted for 50%-75% of the SCOD in the last chamber of the CABR. As a secondary metabolite, some SMP could be consumed at lower feed strength. 展开更多
关键词 carrier anaerobic baffled reactor dilute wastewater soluble microbial product hydraulic residence time feed strength temperature
暂未订购 下载PDF
Optimization of Baffled Rectangular and Prismatic Storage Tank Against the Sloshing Phenomenon 认领 引用 被引量：11
11
作者 Hassan SAGHI NING De-zhi +1 位作者 CONG Pei-wen ZHAO Ming 《China Ocean Engineering》 SCIE EI CSCD 2020年第5期664-676,共13页
The fluid motion in partially filled tanks with internal baffles has wide engineering applications. The installation of baffles is expected to reduce the effect of sloshing as well as the consequent environmental dama... The fluid motion in partially filled tanks with internal baffles has wide engineering applications. The installation of baffles is expected to reduce the effect of sloshing as well as the consequent environmental damages. In the present study, a series of experimental tests are performed to investigate the sloshing phenomenon in a baffled rectangular storage tank. In addition, the sloshing phenomenon is also modeled by using Open Foam. Based on the experimental and numerical studies, optimization of the geometric parameters of the tank is performed based on some criteria such as tank area, entropy generation, and the horizontal force exerted on the tank area due to the sloshing phenomenon.The optimization is also carried out based on the entropy generation minimization analysis. It is noted that the optimum baffle height is in the range of h_b/h_w=0.5-0.75 in the present study(where h_b and h_w are the baffle height and water depth, respectively). Based on the results, the optimal design of the tank is achieved with R_A= 0.9-1.0(where R_A=L/W, L and W are the length and width of the tank, respectively). The results also show that the increase of h_b can lead to a decrease of the maximum pressure and horizontal force exerted on the tank. It is also noted that the horizontal force exerted on the tank firstly continues to increase as the sway motion amplitude increases.However, as the normalized motion amplitude parameter, a/L(The parameter a is the motion amplitude), exceeds0.067, the effect of motion amplitude on the force is not obvious. The same optimization is also performed in the multiple-variable-baffled tank and prismatic storage tank. 展开更多
关键词 baffled rectangular storage tank experimental tests sloshing phenomenon optimization entropy generation Open Foam
暂未订购 下载PDF
Reduced power consumption in stirred vessel with high solid loading by equipping punched baffles 认领 引用 被引量：4
12
作者 Xia Xiong Zuohua Liu +3 位作者 Changyuan Tao Yundong Wang Fangqin Cheng Hong Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第4期203-214,共12页
Solid-liquid suspension in stirred tank is a common operation in the chemical industry. The power consumption, flow pattern and flow field instability of three systems named as unbaffled stirred tank, traditional baff... Solid-liquid suspension in stirred tank is a common operation in the chemical industry. The power consumption, flow pattern and flow field instability of three systems named as unbaffled stirred tank, traditional baffled stirred tank and punched baffled stirred tank(Pun-BST) were studied by using the computational fluid dynamic analysis. Results showed that perforating holes in the baffles could reduce power consumption of mixing. Meanwhile, the punched baffle system could maintain the solids in suspension as traditional baffle system. The results also showed that the baffles could increase the “effective flow” of stirred tank even though the whole velocity of the vessel is lower than un-baffled vessel. In addition, both the solid-liquid suspension and “effective flow” were related to instability of the flow field.Perfect solid-liquid suspension results always along with obvious instability of the flow field. But, the strengthening effect of punched baffle on flow field instability mainly happened in the near-wall area.It's because the collision and aggregation among sub-streams induced by holes intensified the unstable fluid flow. On the whole, the Pun-BST system provided much better mixing characteristics and recommended to apply in the industrial process. 展开更多
关键词 Solid-liquid suspension Punched baffle Energy conservation Flow field instability Effective fluxion
暂未订购 下载PDF
Characteristics of Fin Baffle Packing Used in Rotating Packed Bed 认领 引用 被引量：25
13
作者 栗秀萍 刘有智 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2010年第1期55-60,共6页
For an alcohol/water system and with fin baffle packing,continuous distillation experiments were carried out in a rotating packed bed(RPB)system at atmospheric pressure.The effects of the average high gravity factor(... For an alcohol/water system and with fin baffle packing,continuous distillation experiments were carried out in a rotating packed bed(RPB)system at atmospheric pressure.The effects of the average high gravity factor(β),liquid reflux ratio(R)and feedstock flux(F)on the momentum transfer and mass transfer were investigated. The gas phase pressure drop of RPB increased with the average high gravity factor,liquid reflux ratio and feedstock flux,which was 13.55-64.37 Pa atβof 2.01-51.49,R of 1.0-2.5,and F of 8-24 L·h1for a theoretical tray in the RPB with fin baffle packing.The investigation on the mass transfer in the RPB with different packings showed that the number of transfer units of RPB with a packing also increased with the average high gravity factor,reflux ratio and feedstock flux.It is found that the fin baffle packing(packing III)presents the best mass transfer performance and lowest pressure drop for the height equivalent to a theoretical plate(HETP),which is 6.59-9.84 mm. 展开更多
关键词 characteristic fin baffle packing distillation rotating packed bed
暂未订购 下载PDF
The concave-wall jet characteristics in vertical cylinder separator with inlet baffle component 认领 引用 被引量：3
14
作者 Jing Zhang Zhongyi Ge +3 位作者 Wei Wang Bin Gong Yaxia Li Jianhua Wu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第2期178-189,共12页
The concave-wall jet was formed in the vertical cylinder separator with inlet baffle component.The effect of curvature of radial baffle on the jet flow in the separator was investigated by the experiment of concentrat... The concave-wall jet was formed in the vertical cylinder separator with inlet baffle component.The effect of curvature of radial baffle on the jet flow in the separator was investigated by the experiment of concentration and the numerical simulation of species transport.The results show that the concave-wall jet was confined within the narrow region near the concave-wall and the flow disturbance in the center of separator was weakened.The distribution of concentration and the flow region of wall jet depended on the curvature of radial baffle(K).Compared with the turbulent intensity of the plate baffle(K=0),that of concave baffle(K=2)reduced by 6.1%and the turbulent intensity of convex baffle(K=-2)increased by 13.5%.The best flow stability was obtained by the concave baffle because the baffle outlet was similar to convergent nozzle.The outlet convergent angle was between 0°and 19.5°when 0≤K≤2.The secondary vortices were caused by the tangential velocity irregularity on the cross-section of two axial baffles in the separator with convex baffle.The baffle with K≥0 was more suitable in separator inlet than that with K<0. 展开更多
关键词 Concave-wall jet Baffle component Curvature Concentration Numerical simulation
暂未订购 下载PDF
Hydraulic characteristics of an anaerobic baffled reactor as onsite wastewater treatment system 认领 引用 被引量：15
15
作者 Yuttachai Sarathai Thammarat Koottatep Antoine Morel 《Journal of Environmental Sciences》 SCIE EI CAS 2010年第9期1319-1326,共8页
The feasibility of using anaerobic baffled reactor （ABR） as onsite wastewater treatment system was discussed. The ABR consisted of one sedimentation chamber and three up-flow chambers in series was experimented unde... The feasibility of using anaerobic baffled reactor （ABR） as onsite wastewater treatment system was discussed. The ABR consisted of one sedimentation chamber and three up-flow chambers in series was experimented under different peak flow factors （PFF of 1 to 6）, superficial gas velocities （between 0.6 and 3.1 cm/hr） and hydraulic retention times （HRT） （24, 36 and 48 hr）. Residence time distribution （RTD） analyses were carded out to investigate the hydraulic characteristics of the ABR. It was found that the PFF resulted in hydraulic dead space. The dead space did not exceed 13% at PFF of 1, 2 and 4 while there was 2-fold increase （26%） at PFF of 6. Superficial gas velocities did not result in more （biological） dead space. The mixing pattern of ABR tended to be a completely- mixed reactor when PFF increased. Superficial gas velocities did not affect mixing pattern. The effects of PFF on mixing pattern could be minimized by higher HRT （48 hr）. The tank-in-series （TIS） model （N = 4） was suitable to describe the hydraulic behaviour of the studied system. The HRT of 48 hr was able to maintain the mixing pattern under different flow patterns, introducing satisfactory hydraulic efficiency. Chemical oxygen demand （COD） and total suspended solids （TSS） removals under all flow patterns were achieved more than 85% and 90%, respectively. The standard deviation of effluent COD and TSS concentration did not exceed 15 mg/L. 展开更多
关键词 anaerobic baffled reactor dead space hydraulic characteristics onsite system peak flow factor
暂未订购 下载PDF
Effects of Temperature and Hydraulic Residence Time (HRT) on Treatment of Dilute Wastewater in a Carrier Anaerobic Baffled Reactor 认领 引用 被引量：6
16
作者 HUA-JUN FENG LI-FANG HU +2 位作者 DAN SHAN CHENG-RAN FANG DONG-SHENG SHEN 《Biomedical and Environmental Sciences》 SCIE CAS 2008年第6期460-466,共7页
Objective To examine the effect of hydraulic residence time （HRT） on the performance and stability, to treat dilute wastewater at different operational temperatures in a carrier anaerobic baffled reactor （CABR）, a... Objective To examine the effect of hydraulic residence time （HRT） on the performance and stability, to treat dilute wastewater at different operational temperatures in a carrier anaerobic baffled reactor （CABR）, and hence to gain a deeper insight into microbial responses to hydraulic shocks on the base of the relationships among macroscopic performance, catabolic intermediate, and microcosmic alternation. Methods COD, VFAs, and microbial activity were detected with constant feed strength （300 mg/L） at different HRTs （9-18 h） and temperatures （10℃-28℃） in a CABR. Results The removal efficiencies declined with the decreases of HRTs and temperatures. However, the COD removal load was still higher at short HRT than at long HRT. Devastating reactor performance happened at temperature of 10℃ and at HRT of 9 h. HRTs had effect on the VFAs in the reactor slightly both at high and low temperatures, but the reasons differed from each other. Microbial activity was sensitive to indicate changes of environmental and operational parameters in the reactor. Conclusion The CABR offers to certain extent an application to treat dilute wastewater under a hydraulic-shock at temperatures from 10℃to 28℃. 展开更多
关键词 Carrier anaerobic baffled reactor Dilute wastewater Hydraulic residence time Temperature
暂未订购 下载PDF
Effects of Shape and Quantity of Helical Baffle on the Shell-side Heat Transfer and Flow Performance of Heat Exchangers 认领 引用 被引量：8
17
作者 杜文静 王红福 程林 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第3期243-251,共9页
Shape and quantity of helical baffles have great impact on the shell-side performance of helical baffled heat exchangers （HBHE）. In this work, three physical models of HBHE with baffles of different shape （trisecti... Shape and quantity of helical baffles have great impact on the shell-side performance of helical baffled heat exchangers （HBHE）. In this work, three physical models of HBHE with baffles of different shape （trisection, quadrant and sextant sector） were investigated. Numerical simulations were performed on HBHE at three helix an- gles （10°, 25° and 40°） by the software ANSYS CFX. Analyses of numerical results indicate that the sextant HBHE shows relatively better fluid flow performance because the leakage flow in the triangle area is evidently reduced and the fluid streamline appears much closer to an ideal spiral flow, while the trisection and quadrant HBHE show more scattered and disordered streamline distributions. The convective heat transfer coefficient and pressure drop in three types of HBHE were presented. Further investigations on the shell side performance with different helical baf- fles were implemented by the field synergy theory. Both theoretical and numerical analyses gave support on the re- lations between helical baffle shape and shell-side performance. This paper may provide useful reference for the selection of baffle shade and auantitv in HBHE. 展开更多
关键词 helical baffled heat exchanger trisection quadrant sextant field synergy principle
暂未订购 下载PDF
Violent Transient Sloshing-Wave Interaction with a Baffle in a Three-Dimensional Numerical Tank 认领 引用 被引量：7
18
作者 XUE Mi-An ZHENG Jinhai +1 位作者 LIN Pengzhi XIAO Zhong 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第4期661-673,共13页
A finite difference model for solving Navier Stokes viscous liquid sloshing-wave interaction with baffles in a tank. equations with turbulence taken into accotmt is used to investigate The volume-of-fluid and virtual ... A finite difference model for solving Navier Stokes viscous liquid sloshing-wave interaction with baffles in a tank. equations with turbulence taken into accotmt is used to investigate The volume-of-fluid and virtual boundary force methods are employed to simulate free surface flow interaction with structures. A liquid sloshing experimental apparatus was established to evaluate the accuracy of the proposed model, as well as to study nonlinear sloshing in a prismatic tank with the baffles. Damping effects of sloshing in a rectangular tank with bottom-mounted vertical baffles and vertical baffles touching the free surface are studied numerically and experimentally. Good agreement is obtained between the present numerical results and experimental data. The numerical results match well with the current experimental data for strong nonlinear sloshing with large free surface slopes. The reduction in sloshing-wave elevation and impact pressure induced by the bottom-mounted vertical baffle and the vertical baffle touching the free surface is estimated by varying the external excitation frequency and the location and height of the vertical baffle under horizontal excitation. 展开更多
关键词 transient sloshing wave vertical baffle excitation frequency experimental and numerical study
暂未订购 下载PDF
Analytical Modeling of Fluid Sloshing in A 2D Rectangular Container with A Bottom-Mounted T-Shaped Baffle 认领 引用 被引量：3
19
作者 MENG Xun MA Xiao-zhong +2 位作者 ZHANG You-ming FANG Hai ZHOU Ding 《China Ocean Engineering》 SCIE EI CSCD 2022年第2期299-310,共12页
An analytical procedure is presented to evaluate the fluid sloshing characteristics in a two-dimensional(2D)rectangular container with a bottom-mounted T-shaped baffle.The fluid region is divided into several sub-doma... An analytical procedure is presented to evaluate the fluid sloshing characteristics in a two-dimensional(2D)rectangular container with a bottom-mounted T-shaped baffle.The fluid region is divided into several sub-domains with hypothetical interfaces and the velocities and pressures of the fluid on adjacent interfaces should be identical.The separation of variables in conjunction with the superposition principle is employed to formulate the velocity potential of each sub-domain.The Fourier series expansion is used to derive the eigenvalue equation by substituting the velocity potential solutions into the free surface conditions and the continuity conditions on adjacent interfaces.Under the horizontal base excitation,the total velocity potential of fluid is decomposed of the impulsive and perturbed velocity potentials.The orthogonality of the sloshing modes is demonstrated by implementing Gauss formula.The dynamic response equation is established by incorporating the total velocity potential solution into the surface wave equation.Excellent agreements are achieved between the present results and those from the reported literature and finite element code.Numerical results are exhibited to reveal the effect of the baffle parameters and excitation frequency on sloshing characteristics and responses of liquid. 展开更多
关键词 rectangular container T-shaped baffle sub-domain sloshing characteristics dynamic response
暂未订购 下载PDF
Influence of baffle position on liquid sloshing during braking and turning of a tank truck 认领 引用 被引量：14
20
作者 Ning KANG Kui LIU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2010年第5期317-324,共8页
The influence of baffle position on liquid sloshing during the braking and turning of a tank truck was studied using a volume of fluid(VOF)model.The forces,their positions and weight distribution during braking and th... The influence of baffle position on liquid sloshing during the braking and turning of a tank truck was studied using a volume of fluid(VOF)model.The forces,their positions and weight distribution during braking and the forces and rolling moment during turning were calculated.The reliability of the calculation method was validated by comparisons with experimental results.The results showed that during braking,liquid splashes in the tank and the maximum forces and G(the ratio of weight acting on the front axle to the rear axle)are large when A(the ratio of the arch area above the baffle to the area of cross section)≤0.1.When A≥0.2,as the position of the baffle is lowered,the maximum of Fx(the force in direction x)first decreases then increases,and the maximum of Fy(the force in direction y)and G increase.During turning,liquid splashes in the tank and the maximum forces and M(the rolling moment)are large when D(the ratio of the arch area above the baffle to the area of cross section)≤0.2.When D≥0.3,as the position of the baffle is lowered,the maximums of Fy,Fz(the force in direction z)and M increase. 展开更多
关键词 Tank truck Volume of fluid(VOF)method Liquid sloshing Two phase flow Baffle
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 8 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈