Leidenfrost Vapor Layers Reduce Drag without the Crisis in High Viscosity Liquids
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractThe drag coefficient CD of a solid smooth sphere moving in a fluid is known to be only a function of the Reynolds number Re and diminishes rapidly at the drag crisis around Re∼3×105. A Leidenfrost vapor layer on a hot sphere surface can trigger the onset of the drag crisis at a lower Re. By using a range of high viscosity perfluorocarbon liquids, we show that the drag reduction effect can occur over a wide range of Re, from as low as ∼600 to 105. The Navier slip model with a viscosity dependent slip length can fit the observed drag reduction and wake shape. © 2016 American Physical Society.
CitationVakarelski IU, Berry JD, Chan DYC, Thoroddsen ST (2016) Leidenfrost Vapor Layers Reduce Drag without the Crisis in High Viscosity Liquids. Physical Review Letters 117. Available: http://dx.doi.org/10.1103/PhysRevLett.117.114503.
SponsorsThis work was supported by the King Abdullah University of Science and Technology and in part by the Australian Research Council through a Discovery Project Grant to D. Y. C. C.
PublisherAmerican Physical Society (APS)
JournalPhysical Review Letters