A liquid drop impact on a liquid pool with an inclined bottom substrate

A droplet impact phenomenon is one of the most common behaviors in nature. When a liquid droplet hits the liquid surface, it bounces and sometimes it shows peculiar jet behaviors depending on the experimental conditions. We investigated a vertical drop impingement onto a liquid pool with an oblique bottom wall. The experimental results were observed using a high speed camera. After the droplet impact, the oblique bottom of a liquid chamber generated asymmetric crater at the retraction regime followed by the inclined central jet toward the solid surface edge. We studied how the jet rebounds and tilts depending on various experimental parameters, e.g. depth, substrate angle, droplet diameter, impact velocity, surface tension and viscosity. This study presented the threshold condition to generate the inclined jet based on geometrical and physical variables. We will provide physical arguments to explain our experimental observation at the talk. We expect that this feature could be used in controlling the bounced jet direction near the edge of a liquid chamber.