TY - JOUR
T1 - Leidenfrost Vapor Layers Reduce Drag without the Crisis in High Viscosity Liquids
AU - Vakarelski, Ivan Uriev
AU - Berry, Joseph D.
AU - Chan, Derek Y. C.
AU - Thoroddsen, Sigurdur T
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This 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.
PY - 2016/9/8
Y1 - 2016/9/8
N2 - The 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.
AB - The 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.
UR - http://hdl.handle.net/10754/621956
UR - http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.114503
UR - http://www.scopus.com/inward/record.url?scp=84988727828&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.117.114503
DO - 10.1103/PhysRevLett.117.114503
M3 - Article
C2 - 27661694
SN - 0031-9007
VL - 117
JO - Physical Review Letters
JF - Physical Review Letters
IS - 11
ER -