Study of non-Darcy natural convection from a vertical heated surface in a saturated porous medium
Abstract
Experimental investigation of the buoyancy induced boundary layer adjacent to a vertical uniformly heated foil imbedded in a saturated porous medium is described. Temperature profiles were measured for Rayleigh numbers ranging from 136 to 4640 corresponding to Reynolds numbers based on the particle diameter of from 0.85 to 10.5. For Reynolds numbers in excess of 3, the temperature profiles exhibit spatial and temporal fluctuations. The discrepancy in heat transfer is in part attributed to non-Darcy effects. The effect of the permeability increase at the wall/porous medium interface is qualitatively examined for different size particles. The results indicate that the wall effect is a strong function of particle diameter.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1981
- Bibcode:
- 1981STIN...8216374H
- Keywords:
-
- Free Convection;
- Heat Transmission;
- Porous Boundary Layer Control;
- Particle Size Distribution;
- Permeability;
- Porous Materials;
- Temperature Profiles;
- Walls;
- Fluid Mechanics and Heat Transfer