非平整倾斜表面上流动液膜的影响因素分析

基于流体体积函数法(VOF),分别从液体物性和液相入口流速等因素对非平整倾斜表面上的液膜流动特性进行数值模拟,得出流体黏度的增大可增大液膜厚度并降低液膜整体流动速度,但不影响液膜与壁面之间的相位角;流体表面张力影响液膜与壁面之间的相位差及液膜的均匀性;液相入口雷诺数的增大可以增大液膜厚度,当雷诺数增大到一定程度时,液膜厚度不再有明显的变化,且液膜表面趋于光滑。研究结果表明:液膜的流动形式由液体各项物性和液相入口流速共同决定。

Analysis on flow film over uneven and inclined wall

Based on the method of volume of fluid (VOF), numerical simulation of liquid film flow over uneven and inclined wall was simulated, during which factors, such as the physical property and flow rate of liquid-phase, were analyzed. Conclusions are the followings:the increase of fluid viscosity can increase the thickness of liquid film and reduce the overall flow liquid film speed, without affecting the phase angle between liquid film and wall; the surface tension influences the uniformity of film and the phase difference; the bigger the liquid phase inlet Re number is, the thicker the film will be, and when the Re number reduces to a certain value, the thickness has no obvious change, and the membrane surface becomes smooth. The simulation results show that the flow form of the film is determined by fluid physical property and the inlet velocity together.