レーザフォーカス変位計による鉛直流下液膜の測定 : 第2報, 助走領域における波動特性

概要

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This paper presents a new method for measuring the velocity of interfacial waves, flowing down a vertical wall in an entry region using two laser focus displacement meters. The purpose of the study was to clarify the effectiveness of the new method for obtaining detailed information on a wave velocity and to investigate the effect of the length of the entry region on the wave phenomena. The measured wave velocity agreed with that calculated using Nusselt's Law, thus indicating the flow to be laminar in the entry region even at a high flow rate. The measurments of wave velocity and maximum film thickness obtained by this method agreed well with those obtained in previous experimental and theoretical studies. As a result of this study, an empirical equation expressing the relationship between the maximum film thickness and the wave frequency in the entry region was formulated.
1998-03-25