Two·Phase Flow in Multiple Channels : 2nd Report, Flow Characteristics

Abstract

Experiments have been performed on the two-phase flow of air-water mixtures through a multiple channel consisting of two interconnected subchannels. The purpose was to obtain data on the void fraction and to observe the flow pattern when the cross-sectional area of the subchannels is different. The mean void fraction of each subchannel was well correlated with the Smith equation. Photographs showed that a void drift is more prominent in a slug or churn flow, while it is less pronounced in a bubbly flow and an annular flow. The flow pattern in each subchannel has been mapped on a diagram of the superficial velocities of both phases, and its flow pattern boundaries were found to be close to those proposed by Taitel et al.