non-Darcian Effects Research Articles

Non-Darcian effects on vertical-plate natural convection in porous media with high porosities

The present analytical study on the non-Darcian effects on natural convection from a vertical plate embedded in a high-porosity medium shows that the boundary and inertia effects have a significant influence on the velocity profiles and surface heat transfer rate. Both effects are more pronounced in high-porosity media and reduce heat transfer from the heated plate. The boundary effect becomes more noticeable in the region close to the leading edge of the heated plate, while the inertia effect increases with downstream locations on a heated plate. The results also show that as the resistance due to the solid matrix increases, the velocity profile tends toward the conventional exponential form, which results from velocity slip at the boundary.

NON-PARABOLIC FILTRATION BEHAVIOR

ABSTRACT In this paper, the multiphase equations of change are used as a theoretical hasis for analyzing constant pressure, non-parabolic filtration behavior. This theory, verified by experiment, predicts that the medium resistance is the dominant factor influencing filtrate rates and that septum selection, relative to the particulate phase, is the key variable affecting non-parabolic behavior. Experimental data also shows that non-parabolic behavior is more energy efficient than parabolic and that non-parabolic behavior cannot be attributed to non-Darcian effects.

An experimental study of non-Darcian effects in free convection in a saturated porous medium

Preliminary experimental results for the investigation of non-Darcy effects in free convection in a porous medium are reported in this paper. In comparison with experimental results, it is found that the Plumb and Huenefeld theory for non-Darcy flow in a porous medium overestimates the heat transfer rate while underestimates the temperature distribution by a substantial amount.