Gas-liquid mixing equipment has broad industrial applications for its good performance in gas dispersion with increased contact area between gas and liquid phases. In order to understand gas-liquid dispersion in industrial process of shear-thinning liquid system under different working conditions

appropriate rotation mode was first determined experimentally by studying overall gas holdup and relative power demand and effect of apparent gas velocity

system viscosity

and stirring speed on gas holdup and bubble size was then investigated by population balance and multiple size group model simulation. Results showed that

coaxial mixer in contra-rotation mode had larger overall gas holdup and better gas pumping capacity than mixer with single inner impeller or coaxial mixer in co-rotation mode at conditions of ideal gas-liquid dispersion and same power consumption. Increasing apparent gas velocity forced more homogeneous gas holdup and larger bubble size. Increasing system viscosity reduced impeller affecting zone and homogeneity of gas holdup but increased bubble size. Increasing stirring speed enlarged affecting area of circular vortex and extended high gas holdup area.