1 دانشکدهی مهندسی، گروه مهندسی مکانیک، دانشگاه بوعلی سینا همدان
2 پردیس دانشکده های فنی، گروه مهندسی مکانیک، دانشگاه تهران
عنوان مقاله [English]
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.