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INFLUENCE OF COHERENT STRUCTURES ON THE WALL SHEAR STRESS IN AXIAL FLOW BETWEEN A CYLINDER AND A PLANE WALL

DOI: 10.1615/ICHMT.2009.CONV.980
10 pages

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

Résumé

Synchronised hot-film and hot-wire measurements were made in the narrower region of a rectangular channel containing a cylindrical rod. The hot-film probe was mounted flush with the channel bottom wall to measure the wall shear stress, while the hot-wire probe was placed at a fixed position, selected in order to easily detect the passage of coherent structures. Mean and rms profiles of the wall shear stress show the influence of the gap to diameter ratio on their respective distributions. The latter presented peculiarities that could only be explained by the presence of coherent structures in the flow between the rod and the wall. Evidence of this presence is seen in the velocity power spectra. The strong influence of the coherent structures on the wall shear stress spatial and temporal distributions is established through velocity-wall shear stress cross-correlations functions and through conditionally sampled measurements.

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