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The effects of compressibility and target strength on shaped charge jet penetration 认领 引用
1
作者 Qiangqiang Xiao Zhengxiang Huang +2 位作者 Xudong Zu Xin Jia Bin Ma 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第2期244-253,共10页
The penetration of shaped charge jets into targets at high velocities is significantly influenced by the compressibility effect,while at low velocities,the strength effect becomes predominant.In the latter regime,mate... The penetration of shaped charge jets into targets at high velocities is significantly influenced by the compressibility effect,while at low velocities,the strength effect becomes predominant.In the latter regime,material strength dictates the resistance to plastic deformation and flow,a contrast to the shockwave-dominated interactions where compressibility is key.This paper presents a self-consistent compressible penetration theory that considers both the axial penetration and radial crater growth of shaped charge jets into targets.An integrated approach where the axial and radial dynamics are coupled has been proposed,influencing each other through shared physical principles rather than being treated as separate,empirically linked phenomena.The presented theory is rooted in the compressible Bernoulli equation and the linear Rankine-Hugoniot relation.These foundational equations are employed to accurately model the high-pressure shock state and subsequent material flow at the jet-target interface,providing a robust physical basis for the penetration model.Notably,it considers the target material's compressibility,which elevates the pressure at the jet-target interface beyond that observed with incompressible materials.This pressure increase is directly proportional to the target's degree of compressibility.As such,this model of compressible penetration reorients the analytical approach:rather than merely estimating penetration resistance,it determines this value from the target material's specific compressibility and yield strength.This shift from empirical correlations to a physics-based derivation of penetration resistance enhances the model's predictive power,particularly for novel target materials or engagement conditions outside established experimental datasets.This investigation establishes a quantitative link between the material's yield strength and its penetration resistance.The accuracy of this penetration resistance value is paramount,as it significantly influences the predicted crater diameter;indeed,the crater diameter's sensitivity to this resistance underscores the necessity for its precise determination.Ultimately,by integrating the yield strength of the target material,this framework enables the prediction of both the penetration depth and the resultant crater diameter from a shaped charge jet.The theory's validation involved two experimental sets:the first focused on shaped charge jet penetration into 45#steel at varied stand-offs,while the second utilized targets of high-to ultrahigh-strength steel-fiber reactive powder concrete(RPC)with differing strength characteristics.These experimental campaigns were specifically chosen to test the theory against both ductile metallic alloys,where plastic flow is significant,and advanced quasi-brittle cementitious composites,presenting a broad spectrum of material responses and penetration challenges.Resulting hole profiles derived from theoretical calculations demonstrated a strong correspondence with empirical measurements for both material types. 展开更多
关键词 Shaped charge jet Penetration efficiency Compressibility influence Strength impact
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Impact of pharmaceutical(diclofenac)contamination on the compressibility and strength of residual soil:Towards a resilient urban infrastructure 认领 引用
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作者 Thanusan Ranjan Yi En Chng +1 位作者 Izni Zahidi Mavinakere Eshwaraiah Raghunandan 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期3161-3181,共21页
Increased access to pharmaceuticals necessitates proper disposal practices to prevent environmental contamination.Irresponsible disposal leads to the infiltration of pharmaceuticals,which can potentially affect the so... Increased access to pharmaceuticals necessitates proper disposal practices to prevent environmental contamination.Irresponsible disposal leads to the infiltration of pharmaceuticals,which can potentially affect the soil's engineering and agricultural properties.Literature focusing on this topic is limited,which is the motivation of this study.The main aim of this study is to assess the impact of increasing concentrations of pharmaceutical(diclofenac)in pore water on the compressibility and strength characteristics of Malaysian residual soil and potential implications affecting the safety and stability of urban infrastructure.This aim is achieved using a series of standard laboratory experiments to determine one-dimensional(1D)consolidation,direct shear strength,stress-dilatancy,and critical-state behaviors of compacted residual clay samples.The experiments also examined the compressibility and volume change behaviors of normally consolidated soil samples(consolidated at four different initial consolidation pressures)upon sudden infusion of diclofenac solution under time-controlled infusion.The results show that the diclofenac solution significantly influences the response of the residual soil samples,including volume change,strength,and dilatancy behaviors.However,the extent of this influence depends on factors such as the drug matrix,concentration,and type of cations,clay mineralogy,and the significance of the diffused double layer surrounding the clay particles.Further studies employing a more comprehensive range of drugs,soil types,and real-world contamination scenarios(a combination of multiple contaminants)are recommended.The outcomes from this study can inform policy decision-makers on waste disposal regulations(UN-SDG 12)and help develop new or revised long-term design limits to address pharmaceutical intrusion(UN-SDG 11). 展开更多
关键词 Compressibility Critical state(CS) Emerging contaminants Pharmaceuticals Stress-dilatancy Sustainable infrastructure Waste management
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Evaluating poro-elastic production drive mechanisms:Quantifying the potential contribution to well-rates and risk of core handling damage inflating pore-volume compressibility measurements 认领 引用
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作者 Ruud Weijermars 《Energy Geoscience》 EI CAS CSCD 2025年第3期165-180,共16页
By analyzing core data from an offshore Gulf of Mexico reservoir and developing analytical solutions,it can be demonstrated that laboratory measurements on pore-volume compressibility include artifacts,leading to a mi... By analyzing core data from an offshore Gulf of Mexico reservoir and developing analytical solutions,it can be demonstrated that laboratory measurements on pore-volume compressibility include artifacts,leading to a misinterpretation of porosity and permeability trends.A systematic evaluation of poro-elastic changes in pore volumes(and quantifying any consequent fluid expulsion during reservoir compaction)suggests that poro-elastic relaxation may enhance fluid production rates from deep reservoirs by up to 25%.This value may be inadvertently inflated if the core samples used for pore-volume compressibility measurements suffered from handling damage.Nonetheless,poro-elastic fluid expulsion from the pores in producing reservoirs can provide additional lift and thus may enhance the recovery factor.Therefore,the possible contribution to well performance from poro-elastic production drive mechanisms ought to be carefully evaluated in reserves estimation.Reversely,injection wells may encounter poro-elastic suppression of injectivity due to elastic resistance,which would adversely affect the storage coefficient.By integrating geomechanical reservoir response with traditional fluid production models,reservoir model predictions of production under pressure depletion and injection conditions will be more accurate.The new insights reported here are essential for optimizing well performance,improving reservoir management,and extending the economic life of geological reservoirs.However,caution is warranted regarding pore-volume compressibility measurements.To what degree laboratory measurements of pore-volume compressibility measure true values or mainly record handling damage could not be conclusively settled in the present study. 展开更多
关键词 Well performance Pore-volume compressibility Bulk compressibility Fluid compressibility Porosity variation
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Pressure-induced structural evolution in dual-phase rare-earth high-entropy alloy with significantly different compressibility between two phases 认领 引用
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作者 Hangboce Yin Jun-Qiang Wang +7 位作者 Kai Zhang Shu Guo Nana Li Wujing Fu Juntao Huo Jianfei Sun Wenge Yang Yongjiang Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第34期268-274,共7页
1.Introduction Compared with the widely used vapor-compression refrigeration,solid-state cooling based on phase transition offers higher ef-ficiency,environmental friendliness,and smaller volume[1,2].The phase transit... 1.Introduction Compared with the widely used vapor-compression refrigeration,solid-state cooling based on phase transition offers higher ef-ficiency,environmental friendliness,and smaller volume[1,2].The phase transition of solid refrigerants can be triggered by external fields,i.e.,magnetic fields[3-5],electric fields[6,7]. 展开更多
关键词 solid refrigerants rare earth high entropy alloy phase transition pressure structural evolution compressibility solid state cooling dual phase
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Degree-Preserving Distance Compression and Topological Compressibility of Complex Networks 认领 引用
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作者 Jian-Hui Li Zu-Guo Yu Yu-Chu Tian 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第12期24-32,共9页
Accurately modeling real network dynamics is a grand challenge in network science.The network dynamics arise from node interactions,which are shaped by network topology.Real networks tend to exhibit compact or highly ... Accurately modeling real network dynamics is a grand challenge in network science.The network dynamics arise from node interactions,which are shaped by network topology.Real networks tend to exhibit compact or highly optimized topologies.But the key problems arise:how to compress a network to best enhance its compactness,and what the compression limit of the network reflects?We abstract the topological compression of complex networks as a dynamic process of making them more compact and propose the local compression modulus that plays a key role in effective compression evolution of networks.Subsequently,we identify topological compressibility-a general property of complex networks that characterizes the extent to which a network can be compressed-and provide its approximate quantification.We anticipate that our findings and established theory will provide valuable insights into both dynamics and various applications of complex networks. 展开更多
关键词 local compr topological compression node interactionswhich network topologyreal accurately modeling real network dynamics compact highly optimized topologiesbut complex networks network dynamics
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Intelligent modelling of clay compressibility using hybrid meta-heuristic and machine learning algorithms 认领 引用 被引量：13
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作者 Pin Zhang Zhen-Yu Yin +2 位作者 Yin-Fu Jin Tommy HTChan Fu-Ping Gao 《Geoscience Frontiers》 SCIE CAS CSCD 2021年第1期441-452,共12页
Compression index Ccis an essential parameter in geotechnical design for which the effectiveness of correlation is still a challenge.This paper suggests a novel modelling approach using machine learning(ML)technique.T... Compression index Ccis an essential parameter in geotechnical design for which the effectiveness of correlation is still a challenge.This paper suggests a novel modelling approach using machine learning(ML)technique.The performance of five commonly used machine learning(ML)algorithms,i.e.back-propagation neural network(BPNN),extreme learning machine(ELM),support vector machine(SVM),random forest(RF)and evolutionary polynomial regression(EPR)in predicting Cc is comprehensively investigated.A database with a total number of 311 datasets including three input variables,i.e.initial void ratio e0,liquid limit water content wL,plasticity index Ip,and one output variable Cc is first established.Genetic algorithm(GA)is used to optimize the hyper-parameters in five ML algorithms,and the average prediction error for the 10-fold cross-validation(CV)sets is set as thefitness function in the GA for enhancing the robustness of ML models.The results indicate that ML models outperform empirical prediction formulations with lower prediction error.RF yields the lowest error followed by BPNN,ELM,EPR and SVM.If the ranges of input variables in the database are large enough,BPNN and RF models are recommended to predict Cc.Furthermore,if the distribution of input variables is continuous,RF model is the best one.Otherwise,EPR model is recommended if the ranges of input variables are small.The predicted correlations between input and output variables using five ML models show great agreement with the physical explanation. 展开更多
关键词 Compressibility Clays Machine learning Optimization Random forest Genetic algorithm
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Compressibility characteristics of bio-cemented calcareous sand treated through the bio-stimulation approach 认领 引用 被引量：14
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作者 Yijie Wang Ningjun Jiang +3 位作者 Alexandra Clarà Saracho Ogul Doygun Yanjun Du Xiaole Han 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第2期510-522,共13页
Calcareous sand is widely present in coastal areas around the world and is usually considered as a weak and unstable material due to its high compressibility and low strength.Microbial-induced calcium carbonate precip... Calcareous sand is widely present in coastal areas around the world and is usually considered as a weak and unstable material due to its high compressibility and low strength.Microbial-induced calcium carbonate precipitation(MICP)is a promising technique for soil improvement.However,the commonly adopted bio-augmented MICP approach is in general less compatible with the natural soil environment.Thus,this study focuses on the bio-stimulated MICP approach,which is likely to enhance the dominance of ureolytic bacteria for longer period and thus is deemed more efficient.The main objective of this paper is to investigate the compressibility of calcareous sand treated by bio-stimulated MICP approach.In the current study,a series of one-dimension compression tests was conducted on bio-cemented sand pre-pared via bio-stimulation with different initial relative densities(D r).Based on the obtained compression curves and particle size distribution(PSD)curves,the parameters including cementation content,the coefficient of compressibility(a v),PSD,relative breakage(B r),and relative agglomeration(A r)were discussed.The results showed that a v decreased with the increasing cementation content.The bio-cemented sand prepared with higher initial D r had smaller(approximately 20%e70%)a v values than that with lower initial D r.The specimen with higher initial D r and higher cementation content resulted in smaller B r but larger A r.Finally,a conceptual framework featuring multiple contact and damage modes was proposed. 展开更多
关键词 Calcareous sand Bio-cementation Bio-stimulation Compressibility
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Assessment of Two Turbulence Models and Some Compressibility Corrections for Hypersonic Compression Corners by High-order Difference Schemes 认领 引用 被引量：15
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作者 TU Guohua DENG Xiaogang MAO Meiliang 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2012年第1期25-32,共8页
The Spalart-Allmaras （S-A） turbulence model, the shear-stress transport （SST） turbulence model and their compressibility corrections are revaluated for hypersonic compression comer flows by using high-order differ... The Spalart-Allmaras （S-A） turbulence model, the shear-stress transport （SST） turbulence model and their compressibility corrections are revaluated for hypersonic compression comer flows by using high-order difference schemes. The compressibility effect of density gradient, pressure dilatation and turbulent Mach number is accounted. In order to reduce confusions between model uncertainties and discretization errors, the formally fifth-order explicit weighted compact nonlinear scheme （WCNS-E-5） is adopted for convection terms, and a fourth-order staggered central difference scheme is applied for viscous terms. The 15° and 34° compression comers at Mach number 9.22 are investigated. Numerical results show that the original SST model is superior to the original S-A model in the resolution of separated regions and predictions of wall pressures and wall heat-flux rates. The capability of the S-A model can be largely improved by blending Catris＇ and Shur＇s compressibility corrections. Among the three corrections of the SST model listed in the present paper, Catris＇ modification brings the best results. However, the dissipation and pressure dilatation corrections result in much larger separated regions than that of the experiment, and are much worse than the original SST model as well as the other two corrections. The correction of turbulent Mach number makes the separated region slightly smaller than that of the original SST model. Some results of low-order schemes are also presented. When compared to the results of the high-order schemes, the separated regions are smaller, and the peak wall pressures and peak heat-flux rates are lower in the region of the reattachment points. 展开更多
关键词 aerodynamics high-order weighted compact nonlinear scheme hypersonic compression comers turbulence models compressibility corrections shock/boundary layer interactions shock waves
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Effect of compressibility on the hypervelocity penetration 认领 引用 被引量：11
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作者 W.J.Song X.W.Chen P.Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2018年第1期82-98,共17页
We further consider the effect of rod strength by employing the compressible penetration model to study the effect of compressibility on hypervelocity penetration.Meanwhile, we define different instances of penetratio... We further consider the effect of rod strength by employing the compressible penetration model to study the effect of compressibility on hypervelocity penetration.Meanwhile, we define different instances of penetration efficiency in various modified models and compare these penetration efficiencies to identify the effects of different factors in the compressible model. To systematically discuss the effect of compressibility in different metallic rod-target combinations, we construct three cases, i.e., the penetrations by the more compressible rod into the less compressible target, rod into the analogously compressible target, and the less compressible rod into the more compressible target. The effects of volumetric strain, internal energy, and strength on the penetration efficiency are analyzed simultaneously. It indicates that the compressibility of the rod and target increases the pressure at the rodarget interface. The more compressible rodarget has larger volumetric strain and higher internal energy. Both the larger volumetric strain and higher strength enhance the penetration or anti-penetration ability. On the other hand, the higher internal energy weakens the penetration or anti-penetration ability. The two trends conflict, but the volumetric strain dominates in the variation of the penetration efficiency, which would not approach the hydrodynamic limit if the rod and target are not analogously compressible. However, if the compressibility of the rod and target is analogous, it has little effect on the penetration efficiency. 展开更多
关键词 Compressibility Hypervelocity penetration Equation of state(EOS) Shockwave Bernoulli equation
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Effect of silane coupling agents on flowability and compressibility of compound for bonded NdFeB magnet 认领 引用 被引量：4
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作者 Xiaowei Zhang Zilong Wang +4 位作者 Tianhao Li Shengjie Zhu Dunbo Yu Wenlong Yan Yang Luo 《Journal of Rare Earths》 SCIE EI CAS CSCD 2022年第5期772-777,I0004,共6页
Based on the difference of the Y-terminal functional group of the silane coupling agent(Y-Si(X)3),four different silane coupling agents were employed to pretreat the surface of the NdFeB powders.The effects of sila... Based on the difference of the Y-terminal functional group of the silane coupling agent(Y-Si(X)3),four different silane coupling agents were employed to pretreat the surface of the NdFeB powders.The effects of silane coupling agents on the flowability and compressibility of compounds for preparing bonded NdFeB magnets were studied.It is indicated that compounds pretreated by silane coupling agents have weaker friction and meshing force.The apparent density is increased by 0.3 g/cm^(3 )compared with the compound without silane coupling agent,and the radial crushing strength is significantly increased by about 3-4 times.In addition,the epoxy resin is more evenly distributed on the surface of the compounds treated by silane coupling agents observed by scanning electron microscopy,and some agglomerated particles are produced.Also,the compressibility of compounds with silane coupling agents is significantly improved due to the fact that hardening exponents are reduced.However,the addition of silane coupling agents has almost no effect on the magnetic properties of bonded magnets.The special energy was used to manifest the flowability of magnetic powder particles representing the macroscopic performance of the force between powder particles,providing a new direction for the study of the interface compatibility of two-phase or multiphase composite materials. 展开更多
关键词 Bonded NdFeB magnets Silane coupling agent Flowability Special energy Compressibility Rare earths
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A Numerical Research on a Compressibility-correlated Langtry's Transition Model for Double Wedge Boundary Layer Flows 认领 引用 被引量：16
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作者 ZHANG Xiaodong GAO Zhenghong 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2011年第3期249-257,共9页
A new compressibility correlation is introduced in the Langtry's local variable-based transition model to investigate the phe-nomenon on double wedge shock/boundary layer interactions.The cmnputational analysis co... A new compressibility correlation is introduced in the Langtry's local variable-based transition model to investigate the phe-nomenon on double wedge shock/boundary layer interactions.The cmnputational analysis compared with experimental data has been made to assess the influence of the wall temperature and the leading edge nose radius on a hypersonic double wedge boundary layer.It has been found that the laminar boundary layer separation occurs on the first ramp.Furthermore,the wall temperature and the leading edge nose radius have remarkable influence on the separation characteristics in the kink.Comparison of the calculated pressure coefficient distribution and the boundary layer profile with the experimental data shows that better results can be achieved when using the modified transition model. 展开更多
关键词 transition model boundary layer hypersonic double wedge flat compressibility correlation wall temperature blunness radius
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A novel correlation approach for prediction of natural gas compressibility factor 认领 引用 被引量：18
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作者 Ehsan Heidaryan Amir Salarabadi Jamshid Moghadasi 《Journal of Natural Gas Chemistry》 2010年第2期189-192,共4页
Gas compressibility factor （z-Factor） is one of the most important parameters in upstream and downstream calculations of petroleum industries.The importance of z-Factor cannot be overemphasized in oil and gas engine... Gas compressibility factor （z-Factor） is one of the most important parameters in upstream and downstream calculations of petroleum industries.The importance of z-Factor cannot be overemphasized in oil and gas engineering calculations.The experimental measurements,Equations of State （EoS） and empirical correlations are the most common sources of z-Factor calculations.There are more than twenty correlations available with two variables for calculating the z-Factor from fitting in an EoS or just through fitting techniques.However,these correlations are too complex,which require initial value and more complicated and longer computations or have magnitude error.The purpose of this study is to develop a new accurate correlation to rapidly estimate z-Factor.Result of this correlation is compared with large scale of database and experimental data also.Proposed correlation has 1.660 of Absolute Percent Relative Error （EABS） versus Standing and Katz chart and has also 3.221 of EABS versus experimental data.The output of this correlation can be directly assumed or be used as an initial value of other implicit correlations.This correlation is valid for gas coefficient of isothermal compressibility （cg） calculations also. 展开更多
关键词 natural gas compressibility factor Standing and Katz chart correlation
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Low secondary compressibility and shear strength of Shanghai Clay 认领 引用 被引量：5
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作者 李青 吴宏伟 刘国彬 《Journal of Central South University》 SCIE EI CAS 2012年第8期2323-2332,共10页
In order to investigate the compressibility, particularly the secondary compression behaviour, soil structure and undrained shear strength of Shanghai Clay, a series of one-dimensional consolidation tests （some up to... In order to investigate the compressibility, particularly the secondary compression behaviour, soil structure and undrained shear strength of Shanghai Clay, a series of one-dimensional consolidation tests （some up to 70 d） and undrained triaxial tests on high-quality intact and reconstituted soil specimens were carried out. Shanghai Clay is a lightly overconsolidated soil （OCR=1.2-1.3） with true cohesion or bonding. Due to the influence of soil structures, the secondary compression index Ca varies significantly with consolidation stress and the maximum value of C~ occurs in the vicinity of preconsolidation stress. Measured coefficients of secondary compression generally fall in the range of 0.2%-0.8% based on which Shanghai Clay can be classified as a soil with low to medium secondary compressibility. The effect of soil structures on the compressibility of Shanghai Clay is found to reduce with an increase in depth. Soil structure has an important influence on initial soil stiffness, but does not appear to affect undrained shear strength significantly. Undrained shear strengths of intact Shanghai Clay from compression tests are approximately 20% higher than those from extension tests. 展开更多
关键词 Shanghai Clay block sampling secondary compressibility soil structure undrained shear strength
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Nonlinear analysis of consolidation with variable compressibility and permeability 认领 引用 被引量：7
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作者 庄迎春 谢康和 李西斌 《Journal of Zhejiang University-SCIENCE A》 CAS 2005年第3期181-187,共7页
Terzaghi gave a theory of soil consolidation based on the effective stress principle, which was derived on several ideal assumptions to get a simplified theory. To avoid the limitations involved in Terzaghi’s theory,... Terzaghi gave a theory of soil consolidation based on the effective stress principle, which was derived on several ideal assumptions to get a simplified theory. To avoid the limitations involved in Terzaghi’s theory, many efforts are being made by scholars to solve the problems in practical engineering situations. This paper presents a generalized theory for one dimensional consolidation of saturated soft clay with variable compressibility and permeability. The semi-analytical solution presented here takes into account the well known empirical e-logk and e-logp′(σ′) relations under instantaneous loading. Study of the consolida- tion behaviors showed that the ratio of Cc and Ck (the slope of e-logp and e-logk respectively) govern the ratio of consolidation. A simulative laboratory investigation with GDS advanced consolidation system was made to analyze the clay consolidation process and compare the results with the semi-analytical solution. 展开更多
关键词 Compressibility Consolidation Nonlinear Permeability
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Packing,compressibility,and crushability of rockfill materials with polydisperse particle size distributions and implications for dam engineering 认领 引用 被引量：2
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作者 Chao-min Shen Si-hong Liu +3 位作者 Liu-jiang Wang Ji-du Yu Hao Wei Ping Wu 《Water Science and Engineering》 EI CAS CSCD 2022年第4期358-366,共9页
In rockfill dam engineering,particle breakage of rockfill materials is one of the major factors resulting in dam settlement.In this study,one-dimensional compression tests on a series of coarse granular materials with... In rockfill dam engineering,particle breakage of rockfill materials is one of the major factors resulting in dam settlement.In this study,one-dimensional compression tests on a series of coarse granular materials with artificially-graded particle size distributions(PSDs)were carried out.The tests focused on understanding the role of initial PSDs in the dense packing density,compressibility and crushability of coarse granular materials.The effects of fractal dimension(D)and size polydispersity(θ)of PSDs were quantitatively analyzed.Two different loading stages were identified from the logarithms of the stress-strain relationships,with the turning point marked as the yield stress.A similar effect of initial PSDs was observed on the packing density and low-pressure modulus of coarse granular materials.The packing density and low-pressure modulus increased monotonically withθ,and their peak values were attained at a D value of approximately 2.2.However,there was no unique correspondence between the dense packing density and low-pressure modulus.The particle breakage was influenced differently by the initial PSDs,and it decreased with the values of D andθ.The emergence of the unique ultimate state was also identified from both the compression curves and PSDs of the samples after the tests.The potential implications of the test results in the design of both low and high rockfill dams were also demonstrated. 展开更多
关键词 Rockfill materials Packing density Compressibility Particle breakage Rockfill dam
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An efficient correlation for calculating compressibility factor of natural gases 认领 引用 被引量：10
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作者 Navid Azizi Dr.R.Behbahani Dr.M.A.Isazadeh 《Journal of Natural Gas Chemistry》 2010年第6期642-645,共4页
Compressibility factor （z-factor） values of natural gases are necessary in most petroleum engineering calculations.Necessity arises when there are few available experimental data for the required composition,pressur... Compressibility factor （z-factor） values of natural gases are necessary in most petroleum engineering calculations.Necessity arises when there are few available experimental data for the required composition,pressure and temperature conditions.One of the most common methods of calculating z-factor values is empirical correlation.Firstly,a new correlation based on the famous Standing-Katz （S-K） Chart is presented to predict z-factor values.The advantage of this correlation is that it is explicit in z and thus does not require an iterative solution as is required by other methods.Secondly,the comparison between new one and other correlations is carried out and the results indicate the superiority of the new correlation over the other correlations used to calculate z-factor. 展开更多
关键词 natural gas compressibility factor explicit correlation
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Experimental determination and prediction of the compressibility factor of high CO2content natural gas with and without water vapor 认领 引用 被引量：4
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作者 Xiaoqiang Bian Zhimin Du YongTang 《Journal of Natural Gas Chemistry》 CSCD 2011年第4期364-371,共8页
In order to study the effect of different CO2contents on gas compressibility factor(Z-factor),the JEFRI-PVT apparatus has been used to measure the Z-factor of dry natural gas with CO2content range from 10.74 to ... In order to study the effect of different CO2contents on gas compressibility factor(Z-factor),the JEFRI-PVT apparatus has been used to measure the Z-factor of dry natural gas with CO2content range from 10.74 to 70.42 mol%at the temperature range from 301.2 to 407.3 K and pressure range from 7 to 44 MPa.The results show that Z-factor decreases with increasing CO2content in natural gas at constant temperature and increases with increasing temperature for natural gas with the same CO2content.In addition,the Z-factor of water-saturated natural gas with high CO2content has been measured.A comparison of the Z-factor between natural gas with and without saturated water vapor indicates that the former shows a higher Z-factor than the latter.Furthermore,Peng-Robinson,Hall-Yarborough,and Soave-Benedict-Webb-Rubin equations of state(EoS)are used for the calculation of Z-factor of high CO2content natural gas with and without water vapor.The optimal binary interaction parameters(BIP)for PR EoS are presented.The measured Z-factor is compared with the calculated Z-factor based on three models,which shows that PR EoS combined with van der Waals mixing rule for gas without water and Huron-Vidal mixing rule for water-saturated gas,are in good agreement with the experimental data. 展开更多
关键词 compressibility factor CO2 natural gas water vapor equation of state
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Rapidly Estimating Natural Gas Compressibility Factor 认领 引用 被引量：9
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作者 Alireza Bahadori Saeid Mokhatab Brian F.Towler 《Journal of Natural Gas Chemistry》 2007年第4期349-353,共5页
Natural gases containing sour components exhibit different gas compressibility factor （Z） behavior than do sweet gases. Therefore, a new accurate method should be developed to account for these differences. Several ... Natural gases containing sour components exhibit different gas compressibility factor （Z） behavior than do sweet gases. Therefore, a new accurate method should be developed to account for these differences. Several methods are available today for calculating the Z-factor from an equation of state. However, these equations are more complex than the foregoing correlations, involving a large number of parameters, which require more complicated and longer computations. The aim of this study is to develop a simplified calculation method for a rapid estimating Z-factor for sour natural gases containing as much as 90% total acid gas. In this article, two new correlations are first presented for calculating the pseudo- critical pressure and temperature of the gas mixture as a function of the gas specific gravity. Then, a simple correlation on the basis of the standard gas compressibility factor chart is introduced for a quick estimation of sweet gases＇ compressibility factor as a function of reduced pressure and temperature. Finally, a new corrective term related to the mole fractions of carbon dioxide and hydrogen sulfide is developed. 展开更多
关键词 natural gas compressibility factor sour gas critical pressure critical temperature
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Study on one-dimensional consolidation of soil under cyclic loading and with varied compressibility 认领 引用 被引量：4
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作者 庄迎春 谢康和 《Journal of Zhejiang University-SCIENCE A》 CAS 2005年第2期141-147,共7页
This paper presents a semi-analytical method to solve one dimensional consolidation problem by taking consideration of varied compressibility of soil under cyclic loading. In the method, soil stratum is divided equall... This paper presents a semi-analytical method to solve one dimensional consolidation problem by taking consideration of varied compressibility of soil under cyclic loading. In the method, soil stratum is divided equally into n layers while load and consolidation time are also divided into small parts and time intervals accordingly. The problem of one-dimensional consolidation of soil stratum under cyclic loading can then be dealt with at each time interval as one-dimensional linear consolidation of multi-layered soils under constant loading. The compression or rebounding of each soil layer can be judged by the effective stress of the layer. When the effective stress is larger than that in the last time interval, the soil layer is compressed, and when it is smaller, the soil layer rebounds. Thus, appropriate compressibility can be chosen and the consolidation of the layered system can be analyzed by the available analytical linear consolidation theory. Based on the semi-analytical method, a computer program was developed and the behavior of one-dimensional consolidation of soil with varied compressibility under cyclic loading was investigated, and compared with the available consolidation theory which takes no consideration of varied compressibility of soil under cyclic loading. The results showed that by taking the variable compressibility into account, the rate of consolidation of soil was greater than the one predicted by conventional consolidation theory. 展开更多
关键词 Cyclic loading One-dimensional consolidation Semi-analytical solution Varied compressibility of soil
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Measurement Method of Compressibility and Thermal Expansion Coefficients for Density Standard Liquid at 2329 kg/m^3 based on Hydrostatic Suspension Principle 认领 引用 被引量：1
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作者 WANG Jintao LIU Ziyong +1 位作者 XU Changhong LI Zhanhong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2014年第4期779-784,共6页
The accurate measurement on the compressibility and thermal expansion coefficients of density standard liquid at 2329kg/m3（DSL-2329） plays an important role in the quality control for silicon single crystal manufact... The accurate measurement on the compressibility and thermal expansion coefficients of density standard liquid at 2329kg/m3（DSL-2329） plays an important role in the quality control for silicon single crystal manufacturing. A new method is developed based on hydrostatic suspension principle in order to determine the two coefficients with high measurement accuracy. Two silicon single crystal samples with known density are immersed into a sealed vessel full of DSL-2329. The density of liquid is adjusted with varying liquid temperature and static pressure, so that the hydrostatic suspension of two silicon single crystal samples is achieved. The compression and thermal expansion coefficients are then calculated by using the data of temperature and static pressure at the suspension state. One silicon single crystal sample can be suspended at different state, as long as the liquid temperature and static pressure function linearly according to a certain mathematical relationship. A hydrostatic suspension experimental system is devised with the maximal temperature control error ±50 μK; Silicon single crystal samples can be suspended by adapting the pressure following the PID method. By using the method based on hydrostatic suspension principle, the two key coefficients can be measured at the same time, and measurement precision can be improved due to avoiding the influence of liquid surface tension. This method was further validated experimentally, where the mixture of 1, 2, 3-tribromopropane and 1,2-dibromoethane is used as DSL-2329. The compressibility and thermal expansion coefficients were measured, as 8.5′10–4 K–1 and 5.4′10–10 Pa–1, respectively. 展开更多
关键词 silicon single crystal sample hydrostatic suspension density standard liquid at 2329 kg/m～3 compressibility coefficient thermal expansion coefficient measurement
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