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Directional motion of impacting drops on dual-textured surfaces

Vaikuntanathan, V and Sivakumar, D (2012) Directional motion of impacting drops on dual-textured surfaces. In: PHYSICAL REVIEW E, 86 (3, Par).

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Official URL: http://dx.doi.org/10.1103/PhysRevE.86.036315

Abstract

In this work, we analyze the directional movement of impacting liquid drops on dual-textured solid surfaces comprising two different surface morphologies: a textured surface and a smooth surface. The dynamics of liquid drops impacting onto the junction line between the two parts of the dual-textured surfaces is studied experimentally for varying drop impact velocity. The dual-textured surfaces used here featured a variation in their textures' geometrical parameters as well as their surface chemistry. Two types of liquid drop differing in their surface tension were used. The impact process develops a net horizontal drop velocity towards the higher-wettability surface portion and results in a bulk movement of the impacting drop liquid. The final distance moved by the impacting drop from the junction line decreases with increasing impacting drop Weber number We. A fully theoretical model, employing a balance of forces acting at the drop contact line as well as energy conservation, is formulated to determine the variation, with We, of net horizontal drop velocity and subsequent movement of the impacting drop on the dual-textured surfaces.

Item Type: Journal Article
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Additional Information: Copyright for this article belongs to the American Physical Society
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 11 Jan 2013 09:13
Last Modified: 11 Jan 2013 09:13
URI: http://eprints.iisc.ernet.in/id/eprint/45267

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