Numerical Simulation on Single Vapor Bubbles Rising in a Narrow Rectangular Channel

Abstract

Flow pattern identification is the most key precondition for two phase flow and boiling heat transfer calculations. Recent research has shown that flow patterns of air-water two phase flow in narrow rectangular channels are different from that of vapor-water two phase flow. Investigations on single bubbles rising are of fundamental significance to disclosure differences between air-water and vapor-water two phase flow patterns. Hence, it is essential to obtain single bubbles’ move characteristics in narrow rectangular channels. Plenty of studies on single air bubble are available, and few reports on single vapor bubbles are found in narrow rectangular channels. Phase change equations should be obtained before numerical investigation of single vapor bubbles performed. In the present paper, we deduced the phase change equations on the single vapor bubble surface from experimental data. Based on the equations, numerical model for single vapor bubbles rising in a narrow rectangular channel was created. Numerical results fit well with experimental data.