Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3081420
Keywords
coatings; contact angle; drag reduction; drops; hydrophobicity; surface topography; water
Categories
Funding
- UK EPSRC [EP/D500826/1]
- Engineering and Physical Sciences Research Council [EP/E063489/1, EP/D500826/1, EP/E043097/1] Funding Source: researchfish
- EPSRC [EP/E063489/1, EP/E043097/1] Funding Source: UKRI
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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.
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