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Turbulence structure for plane Poiseuille–Couette flow and implications for drag reduction over surfaces with slip
Author(s) -
Spencer Nicholas B.,
Lee Lloyd L.,
Parthasarathy Ramkumar N.,
Papavassiliou Dimitrios V.
Publication year - 2009
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20136
Subject(s) - hagen–poiseuille equation , mechanics , couette flow , drag , turbulence , reynolds number , open channel flow , physics , slip (aerodynamics) , taylor–couette flow , eddy , classical mechanics , flow (mathematics) , thermodynamics
Direct numerical simulations were used to simulate plane channel and plane Poiseuille–Couette flows. For Poiseuille–Couette flow, the walls of the channel were moving with a specified velocity. This is equivalent to forcing a slip velocity at the wall of the channel, and such flow behaviour can be viewed as the effect due to an ultra‐hydrophobic wall. It was found that the location of the zero Reynolds stress value shifted towards the wall moving in the streamwise direction. The near‐wall eddies were found to be longer and weaker than for the plane‐Poiseuille channel flow. It appears that such an eddy structure can lead to turbulence drag reduction.