毛细压力对薄液膜蒸发的影响

Influence of Capillary Pressure on the Evaporation of Thin Liquid Films

介绍了一个考虑毛细压力对液膜在垂直平板上蒸发影响的模型．导出了此过程的控制方程组并用可变步长的Ｒｕｎｇｅ－Ｋｕｔｔａ方法进行数值积分．数值结果与Ｎｕｓｓｅｌｔ膜冷凝理论的分析解进行比较，当液膜变得足够薄时，结果与Ｎｕｓｓｅｌｔ膜理论产生显著偏差．

A model is presented that considers the influence of capillary pressure on the evaporation of a liquid film on a vertical flat plate. The governing equations are derived and numerically integrated with a step variable Runge Kutta method. The numerical results are compared with the analytical solution from Nusselt′s film condensation theory. The deviation from the Nusselt film theory becomes very prominent when the liquid film becomes thin enough. This can be aributed to the fact that the Nusselt film theory does not consider the influence of capillary pressure on the shape of the liquid film.