High-speed movies of coalescing droplets were obtained using a high-speed camera (Photron FASTCAM SA3) at 3000 frames/s. We determined the jumping velocity of the coalesced droplet from the droplet trajectories, as explained in our previous work (7). Some droplets deviated from the vertical direction during jumping because of the mismatch in droplets sizes, asymmetry in the geometry of the ridge, and asymmetry in coalescence. Thus, we restricted all our experimental analyses to jumping droplets within a deviation of ±10° from the vertical direction.

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