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International Heat Transfer Conference 13

ISBN 印刷: 1-56700-226-9 (CD)
ISBN オンライン: 1-56700-225-0

UNSTEADY FORCED CONVECTION FOR A DEVELOPING FLOW IN A NON SYMMETRIC PERIODIC CHANNEL

DOI: 10.1615/IHTC13.p20.20
page 9

Serge Blancher
Laboratoire des sciences de l'ingénieur Appliquées a la Mécanique et au génie Electrique (SIAME), Université de Pau et des Pays de l'Adour (UPPA), IFR, rue Jules Ferry, BP 7511, 64075 Pau Cedex, France

Rene Creff
Laboratoire de Tranferts Thermiques, Universite de Pau et des Pays de l'Adour Helioparc - Av. du President Angot, 64000 Pau, France; J.E. CNRS n° 034 936 Laboratoire de Mecanique et Energetique - ESEM Universite d'Orleans - 45046 ORLEANS CEDEX

Patrick Le Quere
LESTE UA CNRS 1098 Universite de Poitiers,40 av du Recteur Pineau,86022 Poitiers Cedex- France

要約

In this study we analyse the spatio-temporal evolution of the natural instabilities in a non symmetric wavy channel - a flat plate facing a 2D wavy wall - for a laminar developing flow. The relationship between the spatial structures and intensity of these natural fluctuations on the convective heat transfer is investigated. For a Reynolds number large enough, greater than the critical Reynolds number given by the linear stability, the hydrodynamic entry fluctuations are naturally amplified along the channel until reaching a saturation level. The spatio-temporal structure of the developing flow is in good agreement with the more unstable modes obtained by the linear stability analysis. The wave length of the saturated fluctuations is not equal to the spatial geometric period but corresponds to the maximum of the temporal amplification rate. The spatial amplification rate is directly linked with the temporal one by means of the group velocity. For the thermal point of view, beyond the saturated position, we observe a local heat transfer increase due to these macroscopic fluctuations. Spatially periodic heat flux density boundary condition will allow us to find an optimum position for the wavy wall and inlet velocity characteristics to obtain local convective heat transfer optimum.

IHTC-13 Digital Library

Measurement of fluid temperature with an arrangement of three thermocouples FLOW BOILING OF A HIGHLY VISCOUS POLYMER SOLUTION