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Slippery interfaces for drag reduction

Published online by Cambridge University Press:  01 November 2013

Peichun Amy Tsai
Peichun Amy Tsai*
Affiliation:
Soft Matter, Fluidics, and Interfaces Group, University of Twente, 7500 AE Enschede, The Netherlands
*
†Email address for correspondence: p.a.tsai@utwente.nl
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Abstract

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Inspired by natural interfaces with surprising transport properties, innovative modifications of surfaces have been engineered to reduce drag. The common theme across these new developments is the presence of lubricant patches or layers that decrease the direct contact of viscous liquid with non-slippery solid walls. For laminar flow, the traditional assumption regarding the lubricant layer is a constant shear rate or a steady pressure gradient, implying a net flow rate of the lubricant film. By challenging this assumption, Busse et al. (J. Fluid Mech., vol. 727, 2013, pp. 488–508) rigorously found that the hydrodynamic slip is reduced by the presence of a reversal of lubricant flow close to the wall. The analytical results for velocity field and change in drag provide insight into the optimal design of slippery surfaces with lubricant layers for drag reduction.

JFM classification

Flow Control: Drag reductionMicro-/Nano-fluid dynamics: MicrofluidicsMultiphase and Particle-laden Flows: Multiphase flow

Information

Type
Focus on Fluids
Information
Journal of Fluid Mechanics , Volume 736 , 10 December 2013, pp. 1 - 4
Copyright
©2013 Cambridge University Press 

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