Experimental investigation of droplet formation in microchannel device with an embedded microsieve
A sieve microchannel with embedded structure was designed and the droplet generation process of water-silicone oil system was studied.The dripping and jetting flow were observed under different flow rates of continuous phase and dispersed phase.The effects of two-phase flow rates and interfacial tension on the active pore number distribution and droplet size were investigated.The results showed that the number of active pores increased with the increase of two-phase capillary number.The droplet size decreased with the increase of continuous phase flow rate and decrease of interfacial tension.The droplet size increased in waves with the increase in dispersed phase flow rate.Based on the obtained results,an empirical correlation was proposed to predict the droplet size with good prediction performance.In addition,the effect of the microporous membrane as a flow resistance on the active pore number distribution and droplet size in two-pore microsieve was investigated.The activation of pore became easily under low flow rate of dispersed phase at the presence of microporous membrane as a flow resistance,which led to a smaller droplet size.
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维普
