Multi-dimensional characteristics of upward bubbly flows in a vertical large-size square channel

Sun, Haomin   ; Kunugi, Tomoaki*; Yokomine, Takehiko*; Shen, X.*; Hibiki, Takashi*

An experiment for upward bubbly flows was conducted in a large square channel. The local void fraction, axial gas velocity, axial liquid velocity, interfacial area concentration, and Sauter mean diameter were measured at three axial locations. Based on the measurement data, the flow characteristics through flow development were investigated. The drift-flux parameters were directly determined from the local measurement data through their definitions. It was found that the distribution parameters and the void fractions could be fairly reproduced by the existing correlations for large circular pipes. Furthermore, the interfacial area concentrations could be predicted by existing correlations with reasonable accuracy.