Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T18: Fluids XI
11:30 AM–1:54 PM,
Thursday, March 9, 2023
Room: Room 210
Sponsoring
Unit:
DFD
Chair: Vishal Sankar Sivasankar, University of Maryland, College Park
Abstract: T18.00008 : Lattice Boltzmann Simulations of Self-Rewetting Drops Impinging on Nonuniformly Heated Fluid Interfaces and Solid Surfaces
12:54 PM–1:06 PM
Presenter:
Bashir M Elbousefi
(ASPIRE: University of Colorado Denver)
Authors:
Bashir M Elbousefi
(ASPIRE: University of Colorado Denver)
William T Schupbach
(University of Colorado, Denver)
Kannan Premnath
(University of Colorado, Denver)
Self-rewetting fluids have parabolic dependence of surface tension on temperature with a minimum, and the resulting peculiar interfacial flows have recently been exploited in a variety of applications. For simulating such variable surface tension-driven multi-fluid flows with energy transport, we have constructed a robust phase-field based central moment lattice Boltzmann (LB) algorithm. The latter involves solving one LB equation for interface tracking based on the conservative Allen-Cahn equation, a second LB equation for the motion of fluids with temperature-dependent normal capillary and tangential Marangoni interfacial stresses, and a third LB equation for the energy transport. Moreover, a geometric formulation is used to incorporate wall wetting and contact angle effects. We utilize such a novel algorithm to study the impingement of self-rewetting drops on another self-rewetting fluid layer as well on a solid wall, where both the fluid interface and the solid surface are heated nonuniformly. We report the effect of various characteristic parameters on the post-impingement interfacial fluid dynamics of drop-interface and drop-wall interactions involving self-rewetting fluid drops and compare them with those based on regular fluid drops.
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