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CFD-Based Numerical Simulation of Water Film Flash Evaporation with a New Flash Evaporation Model
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作者 Siyuan Zhao Yong Liu +1 位作者 Yanjun Liu Ping Na 《Transactions of Tianjin University》 EI CAS 2018年第6期563-570,共8页
In this study, a new mass model involving superheat, initial temperature, liquid height, evaporator diameter, and flashing time is established to describe the flash evaporation process of water film. Of 469 sets of fl... In this study, a new mass model involving superheat, initial temperature, liquid height, evaporator diameter, and flashing time is established to describe the flash evaporation process of water film. Of 469 sets of flash experimental data from three previous researches, 305 sets were applied to optimize parameters, and the other 164 sets were used to verify the practicability of the model. The results showed that the mean relative error between the literature data and the model values was less than 16.3%, and the model statistics proved that the model was well-posed. Then, the kinetic model was obtained using the time derivative of the new mass model. Computational fluid dynamics simulation of water film flash evaporation was studied based on a user-defined function program of the new evaporation kinetic model. The new kinetic model shows more consistency with the experimental phenomena in terms of evaporated mass and temperature compared with the evaporation–condensation model in Fluent software and Gopalakrishna's model. This new kinetic model can be extended to describe the flash process of water solution under other conditions. 展开更多
关键词 Flash evaporation evaporation model Well-posedness analysis CFD simulation
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Modeling and simulation of urea-water-solution droplet evaporation and thermolysis processes for SCR systems 被引量:7
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作者 Xubo Gan Dongwei Yao +3 位作者 Feng Wu Jiawei Dai Lai Wei Xingwen Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第8期1065-1073,共9页
A reliable mathematical model of urea-water-solution(UWS) droplet evaporation and thermolysis is developed.The well known Abramzon–Sirignano evaporation model is corrected by introducing an adjustment coefficient con... A reliable mathematical model of urea-water-solution(UWS) droplet evaporation and thermolysis is developed.The well known Abramzon–Sirignano evaporation model is corrected by introducing an adjustment coefficient considering the different evaporation behaviors of UWS droplet at different ambient temperatures. A semidetailed kinetic scheme of urea thermolysis is developed based on Ebrahimian's work. Sequentially, the evaporation characteristics, decomposition efficiency of a single UWS droplet and deposit formation are simulated. As a result, the relation of evaporation time, relative velocity, exhaust temperature and droplet initial diameter is presented. Synchronously, it indicates that temperature is the decisive factor for urea thermolysis. Different temperatures result in different deposit components, and deposit yield is significantly influenced by temperature and decomposition time. The current work can provide guidance for designing urea injection strategy of SCR systems. 展开更多
关键词 SCR UWS evaporation UREA THERMOLYSIS Semi-detailed KINETIC simulation
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Comparisons of Several Evaporation/Precipitation Datasets for the Bohai Sea Based on Salinity Simulation
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作者 MAO Xinyan JANG Wensheng 《Journal of Ocean University of China》 SCIE CAS 2009年第3期209-214,共6页
Evaporation (E) rate and precipitation (P) rate are two significant meteorological elements required in the ocean baro- clinic modeling as external forcings. However, there are some uncertainties in the currently ... Evaporation (E) rate and precipitation (P) rate are two significant meteorological elements required in the ocean baro- clinic modeling as external forcings. However, there are some uncertainties in the currently used E/P rates datasets, especially in terms of the data quality. In this study, we collected E/P rates data from ERA-40, NCEP/NCAR Reanalysis, HOAPS for the Bohai Sea and nine routine stations around Laizhou Bay, and made comparisons among them. It was found that the differences in E/P rates between land and sea are remarkable, which was due to the difference in underlying surfaces. Therefore, the traditional way of using E/P rates acquired on land directly at sea is not correct. Since no final conclusion has been reached concerning the net water transport between the Bohai Sea and the Yellow Sea, it is unfeasible to judge the adequacy of the four kinds of data by using the water budget equation. However, the E/P rates at ERA-40 sea points were considered to he the optimal in terms of temporal/spatial coverage and resolution for the hindcast of salinity variation in the Bohai Sea. Besides, using the 3-D hydrodynamic model HAMSOM (HAMburg Shelf Ocean Model), we performed numerical experiments with different E/P datasets and found that the E/P rates at sea points from ERA-40 dataset are better than those from NCEP/NCAR Reanalysis dataset. If NCEP/NCAR Reanalysis E/P rates are to be used, they need to be adjusted and tested prior to simulation so that more close-to-reality salinity values can be reproduced. 展开更多
关键词 freshwater flux through the underlying surface evaporation/precipitation rate salinity simulation the Bohai Sea
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Measurement and simulation of evaporation from a bare soil
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《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1997年第4期64-71,共8页
MeasurementandsimulationofevaporationfromabaresoilWangHuixiaoInstituteofGeography,ChineseAcademyofSciences,B... MeasurementandsimulationofevaporationfromabaresoilWangHuixiaoInstituteofGeography,ChineseAcademyofSciences,Beijing100101,Chin... 展开更多
关键词 Measurement and simulation of evaporation from a bare soil
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Numerical Simulation of Flow Field and Flow State Division in Thin-Film Evaporators
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作者 CHEN Xing PENG Yitian +1 位作者 HUANG Yao ZOU Kun 《Journal of Donghua University(English Edition)》 CAS 2024年第5期525-535,共11页
The flow field and flow state of thin-film evaporators are complex,and it is significant to effectively divide and quantify the flow field and flow state,as well as to study the internal flow field distribution and ma... The flow field and flow state of thin-film evaporators are complex,and it is significant to effectively divide and quantify the flow field and flow state,as well as to study the internal flow field distribution and material mixing characteristics to improve the efficiency of thin-film evaporators.By using computational fluid dynamics(CFD)numerical simulation,the distribution pattern of the high-viscosity fluid flow field in the thin-film evaporators was obtained.It was found that the staggered interrupted blades could greatly promote material mixing and transportation,and impact the film formation of high-viscosity materials on the evaporator wall.Furthermore,a flow field state recognition method based on radial volume fraction statistics was proposed,and could quantitatively describe the internal flow field of thin-film evaporators.The method divides the high-viscosity materials in the thin-film evaporators into three flow states,the liquid film state,the exchange state and the liquid mass state.The three states of materials could be quantitatively described.The results show that the materials in the exchange state can connect the liquid film and the liquid mass,complete the material mixing and exchange,renew the liquid film,and maintain continuous and efficient liquid film evaporation. 展开更多
关键词 flow state division material mixing thin-film evaporator numerical simulation
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Enhanced Evaporation of Ternary Mixtures in Porous Medium with Microcolumn Configuration
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作者 Bo Zhang Yunxie Huang +4 位作者 Peilin Cui Zhiguo Wang Duo Ding Zhenhai Pan Zhenyu Liu 《Frontiers in Heat and Mass Transfer》 EI 2024年第4期997-1016,共20页
The high surface area of porous media enhances its efficacy for evaporative cooling,however,the evaporation of pure substances often encounters issues including local overheating and unstable heat transfer.To address ... The high surface area of porous media enhances its efficacy for evaporative cooling,however,the evaporation of pure substances often encounters issues including local overheating and unstable heat transfer.To address these challenges,a volume of fluid(VOF)model integrated with a species transport model was developed to predict the evaporation processes of ternary mixtures(water,glycerol,and 1,2-propylene glycol)in porous ceramics in this study.It reveals that the synergistic effects of thermal conduction and convective heat transfer significantly influence the mixtures evaporation,causing the fluctuations in evaporation rates.The obtained result shows a significant increase in water evaporation rates with decreasing the microcolumn size.At a pore size of 30μm and a porosity of 30%,an optimal balance between capillary forces and flow resistance yields a peak water release rate of 96.0%.Furthermore,decreasing the glycerol content from 70%to 60%enhances water release by 10.6%.The findings in this work propose the approaches to optimize evaporative cooling technologies by controlling the evaporation of mixtures in porous media. 展开更多
关键词 Ternary mixtures porous medium evaporation numerical simulation evaporative cooling
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Investigating Transport Properties of Environmentally Friendly Azeotropic Binary Blends Based on Evaporation in Auto-Cascade Refrigeration
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作者 Zhenzhen Liu Hua Zhang +1 位作者 Zilong Wang Yugang Zhao 《Frontiers in Heat and Mass Transfer》 EI 2024年第4期1087-1105,共19页
The exploration of performance and prediction of environmentally friendly refrigerant physical properties represents a critical endeavor.Equilibriummolecular dynamics simulationswere employed to investigate the densit... The exploration of performance and prediction of environmentally friendly refrigerant physical properties represents a critical endeavor.Equilibriummolecular dynamics simulationswere employed to investigate the density and transport properties of propane and ethane at ultra-low temperatures under evaporative pressure conditions.The results of the density simulation of the evaporation conditions of the blends proved the validity of the simulation method.Under identical temperature and pressure conditions,increasing the proportion of R170 in the refrigerant blends leads to a density decrease while the temperature range in which the gas-liquid phase transition occurs is lower.The analysis of simulated results pertaining to viscosity,thermal conductivity,and self-diffusion coefficient reveals heightened deviation levels within the phase transition temperature zone.This increase in deviation attributed to intensified molecular activity.In terms of uncovering the physical mechanism of gas-liquid phase transition,the work illustrates the macroscopic phenomenon of the intensified existing disorder during phase transitions at the molecular level.Molecular dynamics simulations analyzing the thermophysical properties of refrigerant blends from a microscopic point of view can deepen the comprehension of the thermal optimization of refrigeration processes. 展开更多
关键词 Molecular dynamics simulation hydrocarbon binary blends transport properties evaporation
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Simulated Dynamic Evaporation of Yiliping Salt Lake Brine 被引量:1
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作者 CUI Xiangmei WU Zhiming +1 位作者 WEN Xianming ZHANG Xingru 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第S1期305-306,共2页
1 Introduction There are numerous salt lakes in western China(Zheng Mianping,et al.,2011).Yiliping playa on the western Qaidam Basin is a magnesium sulfate subtype dry salt lake with high concentrations of potassium,b... 1 Introduction There are numerous salt lakes in western China(Zheng Mianping,et al.,2011).Yiliping playa on the western Qaidam Basin is a magnesium sulfate subtype dry salt lake with high concentrations of potassium,boron and lithium. 展开更多
关键词 Yiliping PLAYA salt brine underground brine simulated dynamic evaporation
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Numerical simulation of liquid desiccant evaporator driven by heat pump
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作者 NIU Run-ping CHEN Xiao-yi +1 位作者 WANG Zi-ye KUANG Da-qing 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第8期2197-2213,共17页
The standard k-ε turbulence model and discrete phase model (DPM) were used to simulate the heat and mass transfer in a liquid-desiccant evaporator driven by a heat pump using FLUENT software, and the temperature fiel... The standard k-ε turbulence model and discrete phase model (DPM) were used to simulate the heat and mass transfer in a liquid-desiccant evaporator driven by a heat pump using FLUENT software, and the temperature field and velocity field in the device were obtained. The performance of the liquid-desiccant evaporator was studied as the concentration of the inlet solution varied between 21% and 30% and the pipe wall temperature between 30 and 50 ℃. Results show that the humidification rate and the humidification efficiency increased with the inlet air temperature, the solution flow rate, the solution temperature, and the pipe wall temperature. The humidification rate and humidification efficiency decreased with increasing moisture content in inlet air and the concentration of inlet solution. The humidification rate increased substantially but the humidification efficiency decreased as the inlet air flow rate increased. The error between the simulations and experimental results is acceptable, meaning that our model can provide a theoretical basis for optimizing the performance of a humidifying evaporator. 展开更多
关键词 heat pump condensation heat discrete phase model (DPM) liquid desiccant evaporator numerical simulation
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Comparison of pan evaporation and actual evaporation estimated by land surface model in Xinjiang from 1960 to 2005 被引量:6
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作者 刘波 马柱国 +1 位作者 徐晶晶 肖子牛 《Journal of Geographical Sciences》 SCIE CSCD 2009年第4期502-512,共11页
Pan evaporation,an indictor of potential evaporation,has decreased during the last several decades in many parts of the world;the trend is contrary to the expectation that the increase of actual evaporation will accom... Pan evaporation,an indictor of potential evaporation,has decreased during the last several decades in many parts of the world;the trend is contrary to the expectation that the increase of actual evaporation will accompany global warming,known as the pan evaporation paradox.What is the essential relationship between pan evaporation and actual evaporation? This is still an uncertain problem.In this paper,the trends of pan evaporation and actual evaporation are investigated using observational data and observation-constrained simulation results using NCAR Community Land Model(CLM) in Xinjiang from 1960 to 2005.Our analysis suggests that the decreasing trend of annual pan evaporation accompanies the increasing trend of annual actual evaporation,the tendencies of them both have statistical significance(at 99% level and at 95% level,respectively).We also find that there is the same turning point in precipitation,pan evaporation and actual evaporation of 1986,and either before the point or after,pan evaporation has inverse trend comparing with actual evaporation and precipitation.The above analysis indicates that pan evaporation and actual evaporation have complementary relationship.These results support the issue of evaporation paradox described by Brutsaert and Parlange(1998) and suggest that decrease of pan evaporation indicates an increase of actual evaporation in Xinjiang in the past half century.The correlation analysis shows that diurnal temperature range(DTR),wind speed,low cloud cover and precipitation are the most likely driving forces for the reduced pan evaporation and the ascending actual evaporation. 展开更多
关键词 XINJIANG pan evaporation actual evaporation numeral simulation
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An evaporation duct prediction model coupled with the MM5 被引量:2
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作者 JIAO Lin ZHANG Yonggang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2015年第5期46-50,共5页
Evaporation duct is an abnormal refractive phenomenon in the marine atmosphere boundary layer. It has been generally accepted that the evaporation duct prominently affects the performance of the electronic equipment o... Evaporation duct is an abnormal refractive phenomenon in the marine atmosphere boundary layer. It has been generally accepted that the evaporation duct prominently affects the performance of the electronic equipment over the sea because of its wide distribution and frequent occurrence. It has become a research focus of the navies all over the world. At present, the diagnostic models of the evaporation duct are all based on the Monin-Obukhov similarity theory, with only differences in the flux and character scale calculations in the surface layer. These models are applicable to the stationary and uniform open sea areas without considering the alongshore effect. This paper introduces the nonlinear factor a and the gust wind item wg into the Babin model, and thus extends the evaporation duct diagnostic model to the offshore area under extremely low wind speed. In addition, an evaporation duct prediction model is designed and coupled with the fifth generation mesoscale model (MMS). The tower observational data and radar data at the Pingtan island of Fujian Province on May 25-26, 2002 were used to validate the forecast results. The outputs of the prediction model agree with the observations from 0 to 48 h. The relative error of the predicted evaporation duct height is 19.3% and the prediction results are consistent with the radar detection. 展开更多
关键词 evaporation duct diagnosis mesoscale model (MM5) evaporation duct prediction model numerical simulation
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Analytical and numerical studies on a single-droplet evaporation and combustion under forced convection 被引量:5
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作者 L.X.Zhou K.Li 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2015年第4期523-530,共8页
Existing droplet evaporation/combustion mod- els in computational fluid dynamics (CFD) simulation of spray combustion are based on simplified 1-D models. Both these models and recently developed 3-D models of single... Existing droplet evaporation/combustion mod- els in computational fluid dynamics (CFD) simulation of spray combustion are based on simplified 1-D models. Both these models and recently developed 3-D models of single- droplet combustion do not give the conditions for the different existing droplet combustion modes. In this paper, droplet evaporation and combustion are studied both analytically and numerically. In the analytical solution, a 2-D axisymmetric flow surrounding an evaporating and combusting droplet was considered. The governing equations were solved using an integral method, similar to the Karman-Pohlhausen method for solving boundary-layer flows with pressure gradient. The results give a local evaporation rate and flame radius in agree- ment with experimental results. In numerical simulation, 3-D combusting gas flows surrounding an ethanol droplet were studied. The prediction results show three modes of droplet combustion under different relative velocities, explaining the change in the evaporation constant with an increase in relative velocity observed in experiments. This implies that different droplet combustion models should be developed in simu- lating spray combustion. The predicted local evaporation rate and flame radius by numerical simulation are in agree- ment with the analytical solution in the range of azimuthal angles 0° 〈 θ 〈 90°. The numerical results indicate that the drag force of an evaporating and combusting droplet is much smaller than that of a cold solid particle, and thus the currently used drag models should be modified. 展开更多
关键词 Droplet evaporation and combustion Dropletcombustion modes Numerical simulation
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Influence of Wind Deviation Angle on n-Hexane Evaporation Loss of Internal Floating-Roof Tanks 被引量:1
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作者 Huang Weiqiu Xu Manlin +2 位作者 Li Fei Ji Hong Fang Jie 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2020年第2期46-55,共10页
With the increasing attention to environmental protection,it is still necessary to strictly control the oil evaporation loss from the IFRT(internal floating-roof tank)to the atmosphere.Upon using n-hexane as a represe... With the increasing attention to environmental protection,it is still necessary to strictly control the oil evaporation loss from the IFRT(internal floating-roof tank)to the atmosphere.Upon using n-hexane as a representative of light oil,the effects of the WDAs(wind deviation angles)on airflow distribution,the wind speed,the n-hexane vapor concentration,and the evaporation loss rate in the IFRT were investigated,and the mass transfer of the vapor-air was analyzed.The results are shown as follows:when the WDA is 0°,the vapor concentration in the gas space above the floating deck is the lowest;when the WDA is 22.5°,the oil evaporation loss rate is the largest;when the WDA is 45°,the vapor concentration is the highest,but the evaporation loss rate is the smallest.It is recommended to arrange the vent to the wind direction with an angle of 45°to reduce the evaporation loss and protect the atmospheric environment. 展开更多
关键词 wind deviation angle n-hexane evaporation loss internal floating-roof tank numerical simulation wind-tunnel experiment
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Effect of Na and Cl ions on water evaporation on graphene oxide
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作者 Xi Nan Yu-Wei Guo Rong-Zheng Wan 《Nuclear Science and Techniques》 SCIE CAS CSCD 2019年第8期42-49,共8页
Using molecular dynamics simulations, we investigate the influence of Na and Cl ions on the evaporation of nanoscale water on graphene oxide surfaces. As the concentration of NaCl increases from 0 to 1.5 M, the evapor... Using molecular dynamics simulations, we investigate the influence of Na and Cl ions on the evaporation of nanoscale water on graphene oxide surfaces. As the concentration of NaCl increases from 0 to 1.5 M, the evaporation rate shows a higher decrease on patterned graphene oxide than that on homogeneous graphene oxide.The analysis shows an obvious decrease in the evaporation rate from unoxidized regions, which can be attributed to the increased amount of Na^+ ions near the contact lines.The proximity of Na^+ significantly extends the H-bond lifetime of the outermost water molecules, which reduces the number of water molecules diffusing from the oxidized to unoxidized regions. Moreover, the effect of the ions on water evaporation is less significant when the oxidation degree varies in a certain range. Our findings advance the understanding of the evaporation process in the presence of ions and highlight the potential application of graphene oxide in achieving controllable evaporation of liquids. 展开更多
关键词 evaporation IONS GRAPHENE OXIDE Molecular dynamics simulation
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Qualitative analysis and quantitative simulation on Yin-Huang water salinization mechanism in Bei-Da-Gang Reservoir 被引量:1
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作者 ZHAO Wen-yu WANG Qi-shan +2 位作者 WU Li-bo ZHANG Bin WANG Xiao-qin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2005年第5期853-856,共4页
Yellow River water transfer for Tianjin is important in solving the water shortage in Tianjin, which facilitate economic development and social progress for many years. Fresh water drawn from Yellow River( i. e., Yin... Yellow River water transfer for Tianjin is important in solving the water shortage in Tianjin, which facilitate economic development and social progress for many years. Fresh water drawn from Yellow River( i. e., Yin-Huang water) becomes saltier and saltier when being stored in the Bei-Da-Gang reservoir. We qualitatively analyze the water salinization mechanism based on mass transfer theory. The main factors are salinity transfer of saline soil, evaporation concentrating, and the agitation of wind. A simulative experimental pond and an evaporation pond were built beside the Bei-Da-Gang reservoir to quantitatively investigate the water salinization based on water and solute balance in the simulative pond. 80% of increased [Cl^-] is due to the salinity transfer of the saline soil and the other 20% is due to evaporation concentrating, so the former is the most important factor. We found that the salinization of Yin-Huang water can be described with a zero-dimension linear model. 展开更多
关键词 Yin-Huang-Ji-Jin Project water salinization simulative experiment saline soil evaporation concentrating mass transfermathematical model
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Numerical Simulation of Al-Si Alloys Filling in EPC Processes
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作者 魏尊杰 安阁英 常庆明 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1995年第3期75-78,共4页
NumericalSimulationofAl-SiAlloysFillinginEPCProcessesWEIZunJie;ANGeying;CHANGQingming魏尊杰,安阁英,常庆明(Dept.ofMate... NumericalSimulationofAl-SiAlloysFillinginEPCProcessesWEIZunJie;ANGeying;CHANGQingming魏尊杰,安阁英,常庆明(Dept.ofMaterialEngineering,H... 展开更多
关键词 ss:evaporative PATTERN CASTING numerical simulation FILLING process
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An improved numerical model for evaporation with multicomponent gas
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作者 PENG Can XU XiangHua +3 位作者 LIANG XinGang DENG Xiong PENG WenQiang LUO ZhenBing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2024年第11期3443-3449,共7页
Evaporation is a key process in a wide range of industrial applications.To gain a better insight into this process,investigation on the evaporation model is an important aspect.In the present study,it is found that th... Evaporation is a key process in a wide range of industrial applications.To gain a better insight into this process,investigation on the evaporation model is an important aspect.In the present study,it is found that the computation with the Hertz-KnudsenSchrage model is not easy to converge in the numerical simulation of the evaporation with multicomponent gas.The reason for the divergence is that the Hertz-Knudsen-Schrage model will lead to an improper vapor mass fraction which is much larger than the saturated vapor mass fraction in the iterations.To improve the convergence performance,an improved model for evaporation with multicomponent gas is proposed.In the improved evaporation model,when the predicted vapor density is larger than the saturated vapor density,a strategy that calculates the volumetric mass transfer rate with the difference between the saturated vapor density and the current vapor density will be implemented.As a result,the vapor density is bounded by the saturated values and no improper large vapor mass fraction arises in the iterations.The improved evaporation model shows much better convergence performance.In the case of the present study,the improved evaporation model can converge with the time step of 5×10^(-6)s,while the original Hertz-Knudsen-Schrage model cannot converge with the time step of 5×10^(-9)s.The improved evaporation model is also compared with the empirical correlations and shows a good agreement. 展开更多
关键词 evaporation model multicomponent gas numerical simulation
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Numerical Simulation of Heat Transfer Performance for Ultra-Thin Flat Heat Pipe
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作者 YAN Wentao YANG Xin +1 位作者 LIU Tengqing WANG Shuangfeng 《Journal of Thermal Science》 SCIE EI CAS CSCD 2023年第2期643-649,共7页
The heat transfer performance of ultra-thin flat heat pipes with#180 copper mesh wick was studied by numerical simulation for different heating powers.The length,width and height of the ultra-thin flat heat pipe are 8... The heat transfer performance of ultra-thin flat heat pipes with#180 copper mesh wick was studied by numerical simulation for different heating powers.The length,width and height of the ultra-thin flat heat pipe are 80 mm,8.5 mm and 1 mm,respectively.The temperature distribution and flow characteristics of ultra-thin flat heat pipes were simulated by coupling porous media model and user-defined function(UDF)in FLUENT.To validate the accuracy of the numerical model,the simulation results of the ultra-thin flat heat pipe are compared with the experimental data in predicting the evaporation section temperature.The numerical model has good accuracy for the one-dimensional heat transfer method of ultra-thin flat heat pipes.The velocity,pressure drop of the wick and total temperature difference have the same variation trend.With the increase of heating power,the temperature difference of ultra-thin flat heat pipes increases,and the pressure drop and the liquid velocity in the wick also increase. 展开更多
关键词 ultra-thin flat heat pipes evaporation section temperature temperature difference copper mesh simulation
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Simulation and Analysis of Dual-Evaporator Refrigeration System for Electric Vehicles
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作者 Ming Shen Qing Gao 《Automotive Innovation》 CSCD 2020年第4期347-355,共9页
Thermal management system is a crucial part in electric vehicles to ensure battery safety and driving comfort.A refrigerant-based thermal management system of electric vehicles with two evaporators connected in series... Thermal management system is a crucial part in electric vehicles to ensure battery safety and driving comfort.A refrigerant-based thermal management system of electric vehicles with two evaporators connected in series(series system)or in parallel(parallel system)is established.The performances of the two systems are investigated and compared.The results reveal that the optimal refrigerant charge is approximately 600 g.Additionally,there is no correlation between the optimal refrigerant charge,and in the arrangement of heat sinks or the heat loads.Under the optimal refrigerant charge,the coefficient of perfor-mance of the series system ranges from 3.47 to 4.71.The coefficient of performance of the parallel system ranges from 3.40 to 4.59,which is lower than that of the series system.Furthermore,the series system has higher exergy efficiency and better cooling performance.The heat source(cabin)with a small thermal mass placed in the rear evaporator of the series system can weaken the lag of its cooling effect.The additional serial evaporator is an alternative solution to the dual-evaporator thermal management system of electric vehicles. 展开更多
关键词 Lithium-ion battery Thermal management Dual evaporators simulation analysis
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Hydrophilic carbon nanotube membrane enhanced interfacial evaporation for desalination 被引量:5
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作者 Yaqi Hou Qianxiao Wang +3 位作者 Shuli Wang Miao Wang Xuemei Chen Xu Hou 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第4期2155-2158,共4页
Carbon nanotube-based(CNT-based) interfacial evaporation material is one of the most potential materials for solar desalination. Here, we studied the evaporation rate of the CNT-based membranes with different hydrophi... Carbon nanotube-based(CNT-based) interfacial evaporation material is one of the most potential materials for solar desalination. Here, we studied the evaporation rate of the CNT-based membranes with different hydrophilic and hydrophobic chemical modified surfaces using molecular dynamic simulations.We found that the hydrogen bonding density among water molecules at the interface is a key factor in enhancing the evaporation rate. For a hydrophilic CNT-based membrane, the strong interactions between the membrane outer surface and the water molecules can destroy the water-water hydrogen bonding interactions at the interface, resulting in the reduction of the hydrogen bonding density, leading to an enhancement effect in evaporation rate. We also found that there is an optimal thickness for evaporation membrane. These findings could provide some theoretical guidance for designing and exploring advanced CNT-based systems with more beneficial performance in water desalination. 展开更多
关键词 Hydrophilic surface chemistry Carbon nanotube Water evaporation DESALINATION Molecular dynamic simulation
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