Interfacial area transport for bubbly-to-slug transition flows in small diameter pipes

This study aims to experimentally investigate the two-group interfacial area transport in small diameter pipes. Experimental data focusing on bubbly slug transition regime, namely one-group region, are collected a 12.7 mm vertical pipe under adiabatic, air-water conditions. The result shows intergroup transfer can be drastic, especially low superficial liquid velocities. cause of this phenomenon is mainly due large relative bubble size comparing cross-sectional area. wake entrainment effect could enhanced by spherical bubbles that acting like cap or medium-size pipe. Based experimental observation, throughout analysis dependence drastic provided study. models predicting initiation pipes terms and void fraction developed. These compared with two-phase among different sizes results show good agreement. newly developed applied IATE model developing function analogous sigmoid function. With function, revised given new ability phenomenon.