An improved numerical model for evaporation with multicomponent gas  

作　　者：PENG Can XU XiangHua LIANG XinGang DENG Xiong PENG WenQiang LUO ZhenBing 

机构地区：[1]College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China [2]School of Aerospace Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Science China(Technological Sciences)》2024年第11期3443-3449,共7页中国科学（技术科学英文版）

摘　　要：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.

关 键 词：evaporation model multicomponent gas numerical simulation 

分 类 号：TK124[动力工程及工程热物理—工程热物理]