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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2015003732
pages 1123-1145

THE EFFECT OF BLOCKAGE RATIO ON HEAT TRANSFER AND ENTROPY GENERATION IN PULSATING FLOW THROUGH PARALLEL BLUFF PLATES

M. Rahimi
Department of Mechanical Engineering, Golestan University, POB 155, Gorgan, Iran
Ali Akbar Ranjbar
School of Mechanical Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
M. J. Hosseini
Department of Mechanical Engineering, Golestan University, POB 155, Gorgan, Iran

RÉSUMÉ

The effects of frequency and amplitude on the flow field, heat transfer, and entropy generation in pulsating flow through parallel bluff plates at two different blockage ratios are studied numerically using a finite volume approach on a nonuniform staggered grid domain. Diffusion and convection terms are discretized by using a central difference scheme. The semi-fractional step method [revised step method of Kim and Moin (1985)] is used to solve the Navier−Stokes equations. The results show that for a smaller blockage ratio at a low amplitude, the peak value of the mean surface pressure coefficient moves upstream and the local Nusselt number increases with the frequency. This phenomenon occurs also for a low frequency and an increased amplitude.


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