垂直上昇気液環状流における界面せん断応力と圧力損失に与える液体粘度の影響及びその予測法

概要

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The purpose of the present study is to investigate the effects of liquid viscosity on the mean liquid film thicknesses, wave heights, and gas-liquid interfacial shear stresses in vertical-upward cocurrent annular flow in a 26.0mm-inner-diameter-tube. Water and glycerol solution were used as working fluids in order to change the kinematic viscosity of liquid from 0.85×10^<-6> to 8.6×10^<-6>m^2/s. The mean liquid film thicknesses and wave heights were determined using the signals of time-varying cross-sectionally averaged holdup which were detected by a constant current method at a distance of about 3.5m from an air-liquid mixer. The pressure gradients were also measured by a U-tube manometer. As a result we proposed correlations for the mean liquid film thicknesses and for the interfacial friction factors. In addition a method for estimating pressure drop was proposed, which verified that the calculated values were in good agreement with the measured values.
一般社団法人日本機械学会の論文
1996-12-25