A numerical study of thermocapillary migration of a small liquid droplet on a horizontal solid surface

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Title:	A numerical study of thermocapillary migration of a small liquid droplet on a horizontal solid surface
Authors:	Nguyen,HB;Chen,JC
Contributors:	機械工程學系
Keywords:	LEVEL SET METHOD;APPARENT FLUID SLIP;ON-A-CHIP;THERMAL-GRADIENTS;CONTACT LINES;2-PHASE FLOW;MICROFLUIDICS;INTERFACE;DYNAMICS;MOTION
Date:	2010
Issue Date:	2012-03-27 17:01:49 (UTC+8)
Publisher:	國立中央大學
Abstract:	In the present study, the transient thermocapillary migration of a small liquid droplet on a horizontal solid surface is numerically investigated. The droplet has a large static contact angle and a high aspect ratio of the maximum height of the droplet to its footprint. The Navier-Stokes and energy equations for both the droplet and surrounding air are solved through the finite element method. The evolution of the isotherms, the flow fields and the contact angle hysteresis are presented. Two asymmetric thermocapillary vortices appear inside the droplet. The variation of the size of the thermocapillary vortex during the migration process causes the speed of the droplet to first increase significantly, and then decrease gradually to approach a constant value. The higher imposed temperature gradient causes the droplet velocity to reach its maximal value earlier and have a higher final speed. If the static contact angle of the droplet is less than (or higher) than 90, the droplet speed is lower (or higher) since the net thermocapillary momentum in the horizontal direction is diminished (or enhanced) by the presence of capillary force. The present results for the migration velocity and the contact angle hysteresis for a squalane droplet are also in good agreement with the previous experimental results. (C) 2010 American Institute of Physics. [doi:10.1063/1.3432848]
Relation:	PHYSICS OF FLUIDS
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

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