Terminal velocity and drag reduction measurements on superhydrophobic spheres

McHale, Glen, Shirtcliffe, Neil, Evans, Carl and Newton, Michael (2009) Terminal velocity and drag reduction measurements on superhydrophobic spheres. Applied Physics Letters, 94 (6). 064104. ISSN 0003-6951

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Official URL: http://dx.doi.org/10.1063/1.3081420

Abstract

Super water-repellent surfaces occur naturally on plants and aquatic insects and are created in the laboratory by combining micro- or nanoscale surface topographic features with hydrophobic surface chemistry. When such types of water-repellent surfaces are submerged they can retain a film of air (a plastron). In this work, we report measurements of the terminal velocity of solid acrylic spheres with various surface treatments settling under the action of gravity in water. We observed increases in terminal velocity corresponding to drag reduction of between 5% and 15% for superhydrophobic surfaces that carry plastrons.

Item Type: Article
Uncontrolled Keywords: coatings, contact angle, drag reduction, drops, hydrophobicity, surface topography, water
Subjects: F900 Others in Physical Sciences
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Ay Okpokam
Date Deposited: 31 Jan 2012 16:56
Last Modified: 09 May 2017 03:02
URI: http://nrl.northumbria.ac.uk/id/eprint/5171

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