Droplet impact dynamics on an aluminum spinning disk

Droplet impact on a spinning surface has been observed in different industries and plays an important role the performance of industrial systems. In current study, dynamics water droplet hydrophilic disk is investigated. An experimental setup designed way that diameter, velocity, rotational speed, location are precisely controlled. While diameter fixed present other mentioned parameters changed their effects behavior discussed. High-speed imaging used to record under various operating conditions. It demonstrated after impact, spreads due high adhesion between substrate. indicated wetted area function time, centrifugal acceleration. Furthermore, depending parameters, phenomena such as rivulet formation, fingering, detachment secondary droplet(s) observed. angular direction, general, length increases time passes. However, radial first reaches maximum value, then recedes until plateau attained. At this instant, bulk liquid, which called wave moves radially outward from inner boundary toward its outer effect force. Once boundary, size momentum, fingers or rivulets formed, small may detach. The process analyzed comprehensively, empirical correlations for lengths directions, number fingers, onset velocity developed.