Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X20: Drops: Impacts on Solid II
8:00 AM–10:36 AM,
Tuesday, November 21, 2023
Room: 146C
Chair: Venkata Yashasvi Lolla, Virginia Tech
Abstract: X20.00004 : Experimental investigation of droplet descent dynamics and dry surface impacts in a variable ambient pressure environment.
8:39 AM–8:52 AM
Presenter:
Curtis Evans
(Univ of Victoria)
Authors:
Curtis Evans
(Univ of Victoria)
Peter Oshkai
(University of Victoria)
Previous studies have shown that ambient pressure can affect splash dynamics on a dry surface due to changes in the entrapment of ambient gas between the droplet and the surface. The present study considers the impact dynamics in conjunction with the effect of the change in atmospheric pressure on the shape of the descending droplet.
The experiments show that under an ambient pressure of 4 atm, average droplet shape became oblate, and the fluctuations of the aspect ratio of the droplet increased during its descent, compared to standard atmospheric pressure conditions, where the droplet shape was nominally spherical, and the shape oscillations were smaller. During the subsequent impacts of the droplets on a dry smooth surface at the velocity of approximately3 m/s, small secondary droplets of ~50 µm in diameter were ejected in the higher ambient pressure scenario, while no secondary droplets were observed under standard atmospheric pressure conditions.
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