Abstract
Wavy condensate films flowing on a vertical wall have been simulated with a finite difference method in which the algorithm is based on the HSMAC method and free boundary conditions are treated with newly proposed method. A random perturbation given at the leading edge quickly diminishes once, and propagates downstream as small-amplitude long waves. Then the amplitude of the wave increases rapidly at a certain position. The wave shape changes from a sinusoidal wave to a solitary wave which is composed of a big wave and capilary waves. A large circulation flow occurs in the big wave and temperature contour lines are distorted by the circulation flow. The heat transfer is enhanced by space-time variation of the film thickness and convection effects. The higher enhancement rate is obtained for higher Prandtl number. In the present simulation condition, the wave inception occurs at lower film Reynolds number region for higher Prandtl number.
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