2000
DOI: 10.1007/s001140050696
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Fluid Mechanics of Biological Surfaces and their Technological Application

Abstract: A survey is given on fluid-dynamic effects caused by the structure and properties of biological surfaces. It is demonstrated that the results of investigations aiming at technological applications can also provide insights into biophysical phenomena. Techniques are described both for reducing wall shear stresses and for controlling boundary-layer separation. (a) Wall shear stress reduction was investigated experimentally for various riblet surfaces including a shark skin replica. The latter consists of 800 pla… Show more

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Cited by 389 publications
(243 citation statements)
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“…Three-dimensional riblets, which include segmented two-dimensional riblets as well as shark-skin mouldings and replicas have also been studied. Riblet types characterized include aligned segmented-blade riblets (Wilkinson & Lazos 1987), offset segmented-blade riblets (Bechert et al 2000a), offset-threedimensional blade riblets (Bechert et al 2000a) and three-dimensional shark-skin replicas (Bechert et al 2000b;Lang et al 2008;Jung & Bhushan 2010). Most studies are done by changing the non-dimensionalized spacing, s + , by varying only fluid velocity and collecting shear-stress data from a shearstress balance in a wind tunnel or fluid-flow channel.…”
Section: Optimization Of Riblet Geometrymentioning
confidence: 99%
“…Three-dimensional riblets, which include segmented two-dimensional riblets as well as shark-skin mouldings and replicas have also been studied. Riblet types characterized include aligned segmented-blade riblets (Wilkinson & Lazos 1987), offset segmented-blade riblets (Bechert et al 2000a), offset-threedimensional blade riblets (Bechert et al 2000a) and three-dimensional shark-skin replicas (Bechert et al 2000b;Lang et al 2008;Jung & Bhushan 2010). Most studies are done by changing the non-dimensionalized spacing, s + , by varying only fluid velocity and collecting shear-stress data from a shearstress balance in a wind tunnel or fluid-flow channel.…”
Section: Optimization Of Riblet Geometrymentioning
confidence: 99%
“…Most shark species move through water with high efficiency and maintain buoyancy. Through its ingenious design, their skin turns out to be an essential aid in this behaviour by reducing drag by 5-10 per cent and autocleaning ectoparasites from their surface (Bechert et al 1997(Bechert et al , 2000. The very small individual tooth-like scales of shark skin, called dermal denticles (little skin teeth), are ribbed with longitudinal grooves (aligned parallel to the local flow direction of the water), which result in water moving very efficiently over their surface.…”
Section: (C ) Superhydrophobicity In Insectsmentioning
confidence: 99%
“…There are many situations and important applications, such as lubrication, microfluidics, 21,22 biological and technological drag reduction surfaces, 23,24 highspeed rarefied flow, 25,26 polymer melt, 27 and drag reduction in microchannel flows [28][29][30] where the velocity of a viscous fluid exhibits a tangential slip on the wall. It would be reasonable to think of slip in terms of a relation between slip velocity and the wall shear stress.…”
Section: Introductionmentioning
confidence: 99%