Special phenomena from a single liquid drop impact on wetted cylindrical surfaces

Experimental observations concerning various outcomes during a single butanol drop impact on wetted cylindrical surfaces are performed using a high speed digital camera at 10,000 frames per second. It is found that outcomes after impact differ a lot when the cylinder-drop curvature ratio alters from 0.091 to 2.395. For the impact on the wetted cylinder with the curvature ratio smaller than 0.5, rebound, spreading, cymbiform liquid sheet and splashing emerge in succession with impact velocity increase. However, for the wetted cylinder with the curvature ratio much larger than 1, rebound, coalescence, dripping and disintegration are observed. Several three-dimensional simulations are also conducted to investigate the spreading process in the cylinder directrix direction. It is found that the spreading length can be increased by increasing impact velocity. The curvature ratio cannot influence the spreading factor when the curvature ratio is less than 0.5.