Understanding interfacial dynamics during freezing and melting of deposited and sessile water droplets

Abstract

We present an in-depth analysis of sequential ice formation and melt dynamics of both impact deposited and sessile drop. Phenomena like contact line arrest during freezing, ice tip singularity, surface and bulk melting in the deposited drop are shown through careful observations of the free surface and interface. Furthermore, for melting phenomenon surface and bulk melting is observed for deposited droplet and only bulk melting for sessile droplets. For the deposited droplet freezing, the surface temperature has been varied from −10 °C to −60 °C and Weber number has been varied from 2.4 to 18 to get their effect on ice contact angle and contact diameter. Differences in interfacial features during solidification-melting of deposited and sessile drops are also evaluated. Moreover, freezing and melting phenomenon of sessile drop on inclined surfaces showed that for inclined surface angle change from 0° to 75°, the tip asymmetry changes from 0° to 15°.