Abstract
From the view point of the practical importance to the interfacial area transport equation for two-phase flow analyses under various gravity conditions, this study is focusing on the development of the interfacial area transport equation taking the gravity effect into account. In this study, the interfacial area transport equation developed for vertical upward-bubbly flow under normal gravity conditions is modified by considering the body acceleration due to frictional pressure loss and is evaluated by data taken under normal gravity and microgravity conditions. A comparison of the modified interfacial area transport equation with experimental data taken under normal gravity and microgravity conditions shows satisfactory agreement.
