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Effects of spinning motion on the bouncing and coalescence between a spinningdroplet and a non-spinning droplet undergoing the head-on collision werenumerically studied by using a Volume-of-Fluid method. A prominent discovery isthat the spinning droplet can induce significant non-axisymmetric flow featuresfor the head-on collision of equal-size droplets composed of the same liquid.Specifically, a non-axisymmetric bouncing was observed, and it is caused by theconversion of the spinning angular momentum into the orbital angular momentum.This process is accompanied by the rotational kinetic energy loss due to theinteraction between the rotational and radial flows of the droplets. Anon-axisymmetric internal flow and a delayed separation after temporarycoalescence were also observed, and they are caused by the enhanced interfaceoscillation and internal-flow-induced viscous dissipation. The spinning motioncan also promote the mass interminglement of droplets because the locallynon-uniform mass exchange occurs at the early collision stage bynon-axisymmetric flow and is further stretched along the filament at latercollision stages. In addition, it is found that the non-axisymmetric flowfeatures increase with increasing the orthogonality of the initialtranslational motion and the spinning motion of droplets.

Non-axisymmetric flow characteristics in Head-on Collision of Spinning Droplets