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research-article

A Numerical Study on Electrowetting Induced Droplet Detachment from Hydrophobic Surface

[+] Author and Article Information
Md Ashraful Islam

Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, TX 76019, USA
mdashraful.islam@mavs.uta.edu

Albert Y. Tong

Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, TX 76019, USA
tong@uta.edu

1Corresponding author.

ASME doi:10.1115/1.4038540 History: Received November 15, 2016; Revised October 01, 2017

Abstract

Electrowetting induced microwater droplet detachment from hydrophobic surface has been studied numerically. The governing equations for transient microfluidic flow are solved by a finite volume scheme with a two-step projection method on a fixed computational domain. The free surface of the droplet is tracked by the volume-of-fluid method with the surface tension force determined by the continuum surface force model. The static contact angle has been implemented using a wall-adhesion boundary condition at the solid-liquid interface while the dynamic contact angle is computed assuming a fixed deflection from the static contact angle. The results of the numerical model have been validated with published experimental data and the physics of stretching, recoiling and detachment of the droplet have been investigated. A parametric study has been performed in which the effects of droplet volume, voltage amplitude and voltage pulse width have been examined.

Copyright (c) 2017 by ASME
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