Turbulent drag reduction over air- and liquid- impregnated surfaces

Brian J. Rosenberg, Tyler Van Buren, Matthew K. Fu, Alexander J. Smits

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Abstract

Results on turbulent skin friction reduction over air- and liquid-impregnated surfaces are presented for aqueous Taylor-Couette flow. The surfaces are fabricated by mechanically texturing the inner cylinder and chemically modifying the features to make them either non-wetting with respect to water (air-infused, or superhydrophobic case), or wetting with respect to an oil that is immiscible with water (liquid-infused case). The drag reduction, which remains fairly constant over the Reynolds number range tested (100 ≤ Reτ ≤ 140), is approximately 10% for the superhydrophobic surface and 14% for the best liquid-infused surface. Our results suggest that liquid-infused surfaces may enable robust drag reduction in high Reynolds number turbulent flows without the shortcomings associated with conventional superhydrophobic surfaces, namely, failure under conditions of high hydrodynamic pressure and turbulent flow fluctuations.

Original languageEnglish (US)
Article number015103
JournalPhysics of Fluids
Volume28
Issue number1
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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    Rosenberg, B. J., Van Buren, T., Fu, M. K., & Smits, A. J. (2016). Turbulent drag reduction over air- and liquid- impregnated surfaces. Physics of Fluids, 28(1), [015103]. https://doi.org/10.1063/1.4939272