Non-Darcian convective heat transfer in a horizontal duct
- Univ. of Colorado, Boulder, CO (United States)
This paper reports preliminary results of a numerical study on non-Darcian mixed convective heat transfer in a horizontal porous duct discretely heated from below. Two porous media, small glass beads (medium porosity) and a fibrous metal foam (high porosity) are considered, and are assumed saturated with water or air. Numerical results are obtained for different Rayleigh and Peclet numbers to include flows from the buoyancy-dominated through mixed convection to the forced flow. For the two extremes, different numerical formulations are used for fast convergence. It is found that, although the inclusion of non-Darcy effects does not change the qualitative nature of flow and temperature distributions in the bulk of field, those near the heat source are affected significantly, especially at high Rayleigh numbers in both natural and mixed convection regimes. The deviation is also large at very high Peclet numbers for metal foam. The individual contributions of inertia and viscous terms to non-Darcy corrections are evaluated and the local Nusselt number and horizontal velocity profile above the heat source are presented to illustrate the nature of the deviation.
- OSTI ID:
- 435698
- Report Number(s):
- CONF-950828--; ISBN 0-7918-1708-3
- Country of Publication:
- United States
- Language:
- English
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