SHARK-SKIN SURFACES FOR FLUID-DRAG REDUCTION IN TURBULENT FLOW: A REVIEW

Brian Dean; Bharat Bhushan

doi:10.6052/1000-0992-12-065

Volume 42 Issue 6

Nov. 2012

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Brian Dean, Bharat Bhushan. SHARK-SKIN SURFACES FOR FLUID-DRAG REDUCTION IN TURBULENT FLOW: A REVIEW[J]. Advances in Mechanics, 2012, 42(6): 821-836. doi: 10.6052/1000-0992-12-065

Citation:

Brian Dean, Bharat Bhushan. SHARK-SKIN SURFACES FOR FLUID-DRAG REDUCTION IN TURBULENT FLOW: A REVIEW[J]. Advances in Mechanics, 2012, 42(6): 821-836. doi: 10.6052/1000-0992-12-065

Brian Dean, Bharat Bhushan. SHARK-SKIN SURFACES FOR FLUID-DRAG REDUCTION IN TURBULENT FLOW: A REVIEW[J]. Advances in Mechanics, 2012, 42(6): 821-836. doi: 10.6052/1000-0992-12-065

Citation:

Brian Dean, Bharat Bhushan. SHARK-SKIN SURFACES FOR FLUID-DRAG REDUCTION IN TURBULENT FLOW: A REVIEW[J]. Advances in Mechanics, 2012, 42(6): 821-836. doi: 10.6052/1000-0992-12-065

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SHARK-SKIN SURFACES FOR FLUID-DRAG REDUCTION IN TURBULENT FLOW: A REVIEW

doi: 10.6052/1000-0992-12-065

Nanoprobe Laboratory for Bio- and Nanotechnology and Biomimetics (NLBB), Ohio State University, Columbus, OH 43210-1142, USA

Received Date: 2012-05-07
Rev Recd Date: 2012-06-15
Publish Date: 2012-11-25

Abstract

Abstract

The skin of fast-swimming sharks exhibits riblet structures aligned in the direction of flow that are known to reduce skin friction drag in the turbulent-flow regime. Structures have been fabricated for study and application that replicate and improve upon the natural shape of the shark-skin riblets, providing a maximum drag reduction of nearly 10 percent. Mechanisms of fluid drag in turbulent flow and riblet-drag reduction theories from experiment and simulation are discussed. A review of riblet-performance studies is given, and optimal riblet geometries are defined. A survey of studies experimenting with riblet-topped shark-scale replicas is also given. A method for selecting optimal riblet dimensions based on fluid-flow characteristics is detailed, and current manufacturing techniques are outlined. Due to the presence of small amounts of mucus on the skin of a shark, it is expected that the localized application of hydrophobic materials will alter the flow field around the riblets in some way beneficial to the goals of enhanced drag reduction.
- shark skin, drag reduction, riblets, biomimetics, turbulent flow, hydrophobicity

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References(50)

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