Effect of Prandtl number on the turbulent thermal field in annular pipe flow |
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Authors: | M. Ould-Rouiss L. Redjem-Saad G. Lauriat A. Mazouz |
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Affiliation: | 1. Université Paris-Est, MSME UMR 8208 CNRS, 77454 Marne-la-Vallée cedex 2, France;2. Université de Valenciennes, Laboratoire de Mécanique des Fluides, 59326 Valenciennes, France |
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Abstract: | The effect of Prandtl number on the turbulent thermal statistics in fully developed annular pipe flow, with isoflux boundary conditions, is investigated by use of direct numerical simulation, for two values of Reynolds number. The Prandtl number has marked influence on the thermal field. With decreasing Pr, the conductive sublayer at both walls spreads from the walls to the core region, while the root mean square of temperature fluctuations and the turbulent heat fluxes are reduced near both walls. Asymptotic behaviours of these quantities are analyzed. |
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Keywords: | Direct numerical simulation Prandtl number effect Turbulent heat transfer Fully developed annular pipe flow |
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