（1School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2National Engineering Research Center of Distillation Technology, Tianjin 300072, China）
Abstract：
In this paper, theoretical analysis and Computational Fluid Dynamics (CFD) study on falling film process of vertical heating tube for falling film evaporator’s heat transferring was conducted. A three-dimensional numerical simulation of falling film flow was made using FLUENT software which had been further exploited with user defined functions (UDF) to identify the source term of mass and heat transfer. We studied the falling film evaporating and heat of vaporization process of heating liquid membranous falling along the wall. We adopted two-phase flow Mixture model and laminar flow model, Simple algorithms. The simulation results was in 3D performance of the liquid along the direction of movement of the development process of the film formation in the wall, the film thickness was calculated and compared with the theoretical and simulated. The simulation results show that the heating tube of vertical falling film evaporator with the good uniformity characteristics of thin liquid film and the tube surface is relatively easy to form columnar flow. The results show the film thickness is 1.0 mm.
HAO Li, XIAO Xiao-Ming, ZHANG LyuHong, JIANG Bin , SUN Yong-Li.Numerical Simulation of the Flow and Heat Transfer Process of Vertical Tube Falling Film Evaporator[J]. Chemcial Industry and Engineering, 2014,31(2): 60-65
2014, Vol. 31 
