effect of phase velocity and surface tension on droplet formation in flow-focusing device

Two-dimensional computational fluid dynamics (cfd) simulation was performed to study droplet formation of liquid-liquid two-phase flow in a flow-focusing device# the vof technique was used to simulate the two phase interface# among the effective parameters that govern on droplet formation process, the inlet velocity of two phases and the surface tension are two of the most important parameters in the droplet formation process that has influence on droplet size# the simulation results revealed that as continuous phase velocity increases from 0#001 m/s to 0#018 m/s, the droplet size decreases and as dispersed phase velocity increases from 0#002 m/s to 0#016 m/s, the droplet size increases, but the coalescence of the droplets is occured# the results also showed that as surface tension increases from 0#0001 n/m to 0#013 n/m the frequency of droplet formation decreases, while the droplet size increases#