Numerical Simulation of Droplet Shapes on Rough Surfaces

	Nanotech 2002 Vol. 1 Technical Proceedings of the 2002 International Conference on Modeling and Simulation of Microsystems Chapter 2: Micro and Nano Fluidic Systems
	Numerical Simulation of Droplet Shapes on Rough Surfaces
Authors:	N.A. Patankar and Y. Chen
Affilation:	Northwestern University, US
Pages:	116 - 119
Keywords:	superhydrophobicity, contact angle, roughness, drop, numerical simulation
Abstract:	It has been demonstrated that surface roughness causes superhydrophobicity. Our objective is to develop a numerical tool and study the relationship between the roughness characteristics and the apparent contact angle and motion of liquid drops on rough surfaces. As a first step we consider a stationary drop on a substrate with a simple geometry of horizontal grooves. A public domain software is modified to numerically investigate the 3D equilibrium drop shapes on a rough surface. We observe that a drop of given volume and actual contact angle attains different equilibrium positions on a rough substrate. The energies and the apparent contact angles of each equilibrium state are different. The actual contact angle in our simulations was ≥ 90o. It was also seen that for higher values of actual contact angles the liquid tends to move out of the grooves thus leading to the formation of a composite surface of contact on the substrate.
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ISBN:	0-9708275-7-1
Pages:	764
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