Experimental and theoretical study on local interfacial area concentration in bubbly flow

Based on the experimental data of high-speed camera system, several formulations for local interfacial area concentration measurement using a double-sensor conductive probe are validated and evaluated. Using the verified double-sensor probe method, an experiment was carried out to study the distribution characteristics of the interfacial area concentration and void fraction for air-water bubbly flow through a vertical upward pipe. The test section is a transparent tube made of acrylic resin with 40 mm internal diameter. According to the experimental data, a new correlation for the prediction of local interfacial area concentration is developed, and it applies to upward bubbly flow in a vertical pipe.