Abstract
Conventional two-phase flow modeling based on time-averaging hardly predicts a critical heat flux condition induced by flow fluctuation and/or flow regime transition. In this series of study, the discrete bubble model applicable to an isothermal flow has been developed based on one-dimensional mass conservation equation and a limited number of relationships of momentum conservation. In the present paper, this new modeling is further developed so as to include phase change and boiling boundary movement being substantial factors for simulating two-phase flow dynamics of boiling channel. Thus obtained spatio-temporal fluctuation of void fraction well demonstrates typical features observed in a boiling channel with subcooled water at the inlet together with a flow oscillation.
