Abstract

The presented mathematical model enables calculation of the wave surface profile, as well as the fields of velocity and temperature, in falling wavy liquid films. Numerical simulation of wave formation and heat transfer intensity was performed for falling films of liquid nitrogen. Different activation functions for input perturbations were checked for films with different parameters. The dependencies of the time till boiling onset and total local evaporation time on the heat flux density were calculated for different inlet Reynolds numbers. Generalization of the simulation results resulted in a regime map, which describes different mechanisms of film flow decay. The presented results of numerical simulation are in satisfactory agreement with the experimental data.

中文翻译：

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非稳态传热下下落液膜波形成与传热的数值模拟

摘要

所提出的数学模型能够计算出下降的波浪状液膜中的波表面轮廓以及速度和温度场。对液氮降膜进行了波形成和传热强度的数值模拟。检查具有不同参数的胶片的输入扰动的不同激活函数。对于不同的入口雷诺数，计算了直到沸腾开始的时间和总局部蒸发时间对热通量密度的依赖性。模拟结果的一般化产生了状态图，其描述了膜流衰减的不同机制。数值模拟结果与实验数据吻合良好。