Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

NUMERICAL MODELLING OF NON-DARCY CONVECTIVE FLOW IN A POROUS MEDIUM

Get access (open in a dialog) DOI: 10.1615/IHTC11.4030
pages 411-416

Abstrakt

The Forchheimer and post-Forchheimer convective flow fields within a spatially periodic two-dimensional array were investigated numerically using a finite volume method. Exploiting periodic boundary conditions, only one structural unit was taken as a calculation domain to simulate a porous medium of regular arrangement in an infinite space. Continuity, Navier-Stokes and energy equations were considered to reveal the details of the flow and temperature fileds. The microscopic numerical results obtained at a pore scale were processed to extract the macroscopic hydrodynamic and thermal characteristics in terms of the volume averaged quantities. The longitudinal and transverse thermal dispersions predicted using the numerical model agree well with those of experimental data. The numerical experiment also reveals that the flow remains steady and laminar when the pore Reynolds number is less than 100 (i.e. Forchheimer flow regime). Alternating vortices start shedding, as the Reynolds number increases to a few hundred (i.e. post-Forchheimer flow regime), and then, the flow becomes highly unsteady and chaotic, as the Reynolds number exceeds 600.