Please use this identifier to cite or link to this item: https://www.um.edu.mt/library/oar/handle/123456789/100482
Title: Superhydrophobic surfaces to reduce form drag in turbulent separated flows
Authors: Mollicone, Jean-Paul
Battista, F.
Gualtieri, P.
Casciola, C. M.
Keywords: Hydrophobic surfaces
Surface chemistry
Protective coatings
Protective coverings
Issue Date: 2022
Publisher: A I P Publishing LLC
Citation: Mollicone, J. P., Battista, F., Gualtieri, P., & Casciola, C. M. (2022). Superhydrophobic surfaces to reduce form drag in turbulent separated flows. AIP Advances, 12(7), 075003.
Abstract: The drag force acting on a body moving in a fluid has two components, friction drag due to fluid viscosity and form drag due to flow separation behind the body. When present, form drag is usually the most significant between the two and in many applications, streamlining efficiently reduces or prevents flow separation. As studied here, when the operating fluid is water, a promising technique for form drag reduction is to modify the walls of the body with superhydrophobic surfaces. These surfaces entrap gas bubbles in their asperities, avoiding the direct contact of the liquid with the wall. Superhydrophobic surfaces have been vastly studied for reducing friction drag. We show they are also effective in reducing flow separation in turbulent flow and therefore in reducing the form drag. Their conceptual effectiveness is demonstrated by studying numerical simulations of turbulent flow over a bluff body, represented by a bump inside a channel, which is modified with different superhydrophobic surfaces. The approach shown here contributes to new and powerful techniques for drag reduction on bluff bodies.
URI: https://www.um.edu.mt/library/oar/handle/123456789/100482
Appears in Collections:Scholarly Works - FacEngME

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