Effects of temperature-dependent contact angle on the flow dynamics of an impinging droplet on a hot solid substrate

Venkatesan, Jagannath and Rajasekaran, Sangeetha and Das, Anubhav and Ganesan, Sashikumaar (2016) Effects of temperature-dependent contact angle on the flow dynamics of an impinging droplet on a hot solid substrate. In: INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 62 (B). pp. 282-298.

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Abstract

A temperature-dependent dynamic contact angle as a function of temperature-dependent surface tension and reference equilibrium contact angle is proposed for modeling of moving contact line flows, in particular, for computations of liquid droplet impingement on a hot solid substrate. The fluid flow in the liquid droplet is described by the time-dependent incompressible Navier-Stokes equations, whereas the heat transfer in the liquid droplet and in the solid substrate is described by the energy equation. The arbitrary Lagrangian-Eulerian (ALE) approach together with the finite element method is used to solve the governing equations in a time-dependent domain. Further, the Marangoni effects are incorporated into the model without evaluating the tangential derivatives of the temperature on the free surface. The effects of temperature-dependent contact angle on the flow dynamics of the droplet and on the heat transfer from the solid substrate into the liquid droplet are studied for different Reynolds numbers, Weber numbers, solid phase Peclet numbers, solid phase initial temperatures and reference equilibrium contact angles. Numerical studies show that the influence of the temperature-dependent contact angle is negligible in partially wetting droplets, whereas the effects on the wetting diameter and on the total heat transfer are 10.79% and 7.36% respectively in the considered highly wetting and non-wetting droplets. (C) 2016 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Publisher:	ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE INC, 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
Department/Centre:	Division of Interdisciplinary Sciences > Computational and Data Sciences
Date Deposited:	08 Mar 2017 10:06
Last Modified:	12 Oct 2018 10:18
URI:	http://eprints.iisc.ac.in/id/eprint/56307

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