Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session H12: Drops: Impact, Bouncing, Wetting and Spreading III
8:00 AM–10:10 AM,
Monday, November 22, 2021
Room: North 126 ABC
Chair: Alexander Yarin, University of Illinois at Chicago
Abstract: H12.00001 : Underdamped dynamics of a droplet deposited onto a fluid bath*
8:00 AM–8:13 AM
Luke F Alventosa
Luke F Alventosa
(Univ of Warwick)
Daniel M Harris
The deposition of droplets on a fluid interface is studied both experimentally and theoretically. Millimetric drops impact a deep bath of the same fluid and are generated using a custom syringe pump connected to a vertically-oriented needle. Measurements of the droplet trajectory are compared directly to the predictions of a quasi-potential model, as well as fully resolved unsteady Navier-Stokes direct numerical simulations. Both models resolve the time-dependent bath interface shape, droplet trajectory, and droplet deformation. In the quasi-potential model, the droplet and bath shape are decomposed using orthogonal function decompositions leading to a set of coupled damped linear oscillator equations solved using an implicit numerical method. The underdamped dynamics of the drop are directly coupled to the response of the bath through a single-point kinematic match condition which we demonstrate to be an effective and efficient model in certain parameter regimes. Specific scenarios where the oscillations of the droplet and bath play a significant role in the overall dynamics will be highlighted. Ongoing and future work will be discussed.
*We gratefully acknowledge the financial support of the National Science Foundation (CBET-2123371).
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