In-Subchannel Two-Dimensional Flow Structure Induced by Bubble-Liquid Interfacial Forces

Abstract

Flow structure induced by bubble-liquid interfacial forces was investigated by using a two- dimensional CMFD technique. The mass, momentum, turbulence energy and bubble diffusion equations were used as the fundamental equations. The basis for these equations was the two- fluid model: the equation of liquid phase was picked up from the equation system theoretically derived for the gas-liquid two-fluid turbulent flow. Existing interfacial force models were newly introduced into the cross-sectional momentum equations. Asymmetry of non-circular channel like sub-channel caused cross-sectional flow patterns which varied with balance among the interfacial forces. The flow structure characterized void fraction distribution in sub-channel.