NUMERICAL STUDY OF PULSATING FLOW AND HEAT TRANSFER IN A PIPE PARTIALLY FILLED WITH A POROUS MEDIUM

Authors

1 Dept. of Mechanical Engineering Bu-Ali Sina University, Hamedan

2 Faculty of Engineerin Dept. of Mechanical Engineerin University of Tehran

Abstract

The objective of the present work is to perform a detailed numerical study of pulsating flow and heat transfer characteristics in a pipe partially filled with a porous medium. The Brinkman-Forchheimer-extended Darcy model is adopted for the porous matrix region, which is attached at the pipe wall and extends inward, toward the centerline. The effects of the Darcy number, Da, the thickness of the porous layer, S, and the thermal conductivity ratio, Rk, as well as the pulsating frequency and the amplitude, are investigated. The results showed that as the thickness of the porous layer increases or the Darcy number decreases, the pressure drop grows. It was found that the dependence of the Nusselt number, v, on S is not straightforward. For a higher thermal conductivity of porous material, the Nusselt number increases, monotonically, with increasing S, while, for a lower value of Rk, a minimum exists in the distributions. The enhanced longitudinal heat conduction, due to pulsating flow, is also examined. The maximum effective thermal diffusivity is found at a critical thickness of the porous layer.

Keywords

Sharif Journal of Mechanical Engineering
Volume 25, Issue 51.2
Mechanical Engineering
November 2010
Pages 49-58

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