平板降膜流动统计规律的实验研究

Experimental Investigation on Water Film Behavior Falling on Vertical Plate

在WABREC实验台架上，对水膜雷诺数在50～900的范围、水膜垂直流下平板的流动特性进行实验研究，重点讨论平板降膜的膜厚、膜厚的概率密度函数和降膜的表面波动速度的统计规律。实验结果表明，水膜厚度存在两个明显的转捩点，水膜的平均厚度大于水膜层流底层的厚度，水膜厚度实验数据与理论关系式以及其他实验的结果吻合较好。

In this paper, experimental studies on falling water film behaviour on vertical flat plat are carried out in WABREC apparatus. The Reynolds number ranges from 50 to 900. Capacitance probes and high speed camera are adopted to measure the water film thickness and wave velocity. The data are compared with the theoretical solutions and other experiments available in the open literature, and good agreement is obtained. Experimental results on film thickness, its probability density function and wave velocity are presented and discussed.