The flow and dispersion performance of water/octanol in coaxial annular microchannels was investigated. The transport of sulfur acid into water releasing heat was used to achieve liquid-liquid dispersion accompanied with mass and heat transfer. The effects of flow rate and sulfur acid concentration on the flow pattern and droplet size were investigated. The results show that the transport of sulfur acid can result in the formation of new O/W/O flow pattern and the change in flow pattern maps. It was also found that the droplet size decreased with the increase of the transport process. Based on the results

the dynamic interfacial tension of the falling off droplets was calculated and the effects of mass and heat transfer on the liquid-liquid dispersion were analyzed

respectively.