PULSATING FLOW AND HEAT-TRANSFER IN A PIPE PARTIALLY FILLED WITH A POROUS-MEDIUM

A numerical study is made of pulsating flow and heat transfer characte ristics in a circular pipe partially filled with a porous medium. The Brinkman-Forchheimer-extended Darcy model is adopted for the porous ma trix region, which is attached to the pipe wall. The impacts of the Da rcy number Da, the thickness of porous layer S, the ratio of effective thermal conductivity of porous material to fluid, R-k, as well as the pulsating frequency, beta, and the amplitude, A, are investigated. Th e enhanced longitudinal heat conduction due to pulsating how and the e nhanced convective heat transfer from high conducting porous material are examined. The maximum effective thermal diffusivity is found at a critical thickness of porous layer. The effects of pulsating amplitude and frequency on heat transfer are also scrutinized. (C) 1997 Elsevie r Science Ltd.