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EFFECT OF MOVING WALL PROXIMITY ON THE NEAR WAKE OF A CIRCULAR CYLINDER

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.990
pages 1317-1326

Imed Khabbouchi
Laboratoire d'Etude des Systèmes Thermiques et Energétiques Ecole Nationale d'Ingénieurs de Monastir Rue Ibn El Jazzar 5019 Monastir, Tunisie

Mohamed Sadok Guellouz
Laboratoire d'Etudes des Systèmes Thermiques et Energétiques, Ecole Nationale d'Ingénieurs de Monastir, University of Monastir, Avenue Ibn El Jazzar, 5019, Monastir, Tunisie

Stavros Tavoularis
Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario KIN 6N5, Canada

Аннотация

Time resolved PIV measurements were performed in the near wake of a circular cylinder placed close to a moving wall at a Reynolds number of 1500. The flow structure in the cylinder wake can be classified into three regimes, depending on the ratio of wall-cylinder gap G to cylinder diameter D. For G/D ≤ 0.3, pairing between vortices originating in the near-wall shear layer was observed, the power spectra of the velocity in the away-from-wall shear layer had multiple peaks and the Strouhal number of the principal peak deviated significantly from the conventional value of approximately 0.2.

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