Comparison of two turbulent models in simulating evaporating liquid film in a wiped molecular distillator  

作　　者：XIANG Aishuang XU Songlin 

机构地区：[1]National Engineering Research Center for Distillation Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, China National Engineering Research Center for Distillation Technology, School of Chemical Engineering, Tianjin University, Tianjin 300072, China

出　　处：《Science China Chemistry》2005年第3期183-188,共6页中国科学（化学英文版）

基　　金：the National Natural Science Foundation of China(Grant No.20176037).

摘　　要：Velocity field of evaporating liquid film in a wiped molecular distillator was simulated with a computational fluid dynamics (CFD) software, and two turbulent models treating near-wall flow were compared. Differences between wiped and other molecular distillations were intro-duced to explain why turbulent model should be used in this simulation. Three assumptions were made in order to simplify simulating processes. In rotating coordinate system, fixed other settings, the above two turbulent models were used, and the volume of fluid (VOF) multiphase model was also applied to tracking the liquid-gas surface. Both of the simulating results are basically iden-tical with real situation and were compared in several aspects. It was concluded that both of the turbulent models are suitable in this simulation.Velocity field of evaporating liquid film in a wiped molecular distillator was simulated with a computational fluid dynamics (CFD) software, and two turbulent models treating near-wall flow were compared. Differences between wiped and other molecular distillations were intro-duced to explain why turbulent model should be used in this simulation. Three assumptions were made in order to simplify simulating processes. In rotating coordinate system, fixed other settings, the above two turbulent models were used, and the volume of fluid (VOF) multiphase model was also applied to tracking the liquid-gas surface. Both of the simulating results are basically iden-tical with real situation and were compared in several aspects. It was concluded that both of the turbulent models are suitable in this simulation.

关 键 词：wiped MOLECULAR distillation  EVAPORATING liquid film  TURBULENT model  computational fluid dynamics  rotating COORDINATE system. 

分 类 号：N[自然科学总论]