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ENTRANCE EFFECTS ON THE GASEOUS FLOW IN MICROCHANNELS

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.410
pages 553-563

Colette Padet
University of Reims Champagne-Ardenne, GRESPI/Laboratoire de Thermomécanique, Faculté des Sciences PB1039, 51687 Reims, France

Rachid Bessaih
L.E.A.P, Dept. Genie Mecanique, Universite Mentouri de Constantine, Route d'Ain El Bey, 25000 Constantine, Algeria

Yassine Kabar
Université de Jijel, Laboratoire d'Energétique Appliquée et des Matériaux, Faculté des Sciences et de la Technologie, BP. 96, 18000 Jijel, Algeria

Mourad Rebay
University of Reims Champagne-Ardenne GRESPI / Faculte des Sciences PB 1039, 51687 Reims, France

Résumé

This study focuses on the characterization of the heat transfer in parallel plates micro-channel subjected to an imposed constant heat flux (H2) thermal boundary conditions. The fluid is assumed to be incompressible gas with constant properties. The combined effects of the axial conduction in the plates and the rarefaction of the gas are taken into account. The Navier-Stokes and energy equations are solved numerically by the finite volume method with velocity slip and temperature jump at the wall. A computational home code with Fortran language has been developed and its validity has been proved in previous papers of the authors. Grid independent solutions have been obtained. Results are presented for different gas accommodation parameter β and Knudsen number. Effects of the ratios of wall/fluid thermal conductivities and wall/channel thickness ratios have been also integrated in the computational process. The results show significant impacts of these parameters on the entrance developing length and the heat transfer coefficient in both developing and developed flow regions.

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