It is noted from Fig.7 that the curve of the gas-liquid-liquid system lies above that of the liquid-liquid system,which signifies that the aeration damps the macro-mixing efficiency from A=0 Vol.% at B=0.40 L/min.The increase of the percentage of the more viscous dispersed phase leads to a higher effective viscosity. Beyond 10%, the increase drag force between the droplets and the continuous phase because of the further increase of effective viscosity modifies the velocities of droplets and leads to weaker turbulence finally, which results in an increase of mixing time.