环己烯水合过程汽-液两相流动的CFD研究

摘要

Cyclohexene direct hydration is a new process to prepare cyclohexanol. A VOF (volume of fluid) method is presented for predicting the flowing process of the two-phase countercurrent falling film. Three important momentum source terms,including interface shear stress,surface tension and porous medium source term,are considered. On the basis of using a CFD (computational fluid dynamics) model to simulate the influence of viscosity,surface tension and flow resistance,the results show that the viscosity and the surface tension have great influence on the thickness and the fluctuation of liquid film which further affect the mass transfer coefficient,and that high flow resistance will cause liquid membrane rupture which interferes with the mass transfer.%环己烯直接水合是制备环己醇的一种新工艺，本文利用体积率函数法（VOF 法）建立了环己烯水合流动过程的数学模型，考虑了汽-液相间摩擦力动量源项、表面张力动量源项和多孔介质动量源项，定量描述了汽-液两相逆流流动过程。根据计算流体力学（CFD）模型模拟了黏度、表面张力和流动阻力对流动的影响，结果表明黏度和表面张力影响液膜厚度和液面波动程度，进而影响传质；流动阻力过大会导致液膜断裂，不利于传质。