The influence of variable viscosity due to large temperature differences on the onset of convection in porous media
Abstract
The onset of convection in a horizontal, isotropic, water saturated porous medium is considered. The temperature difference between the top and bottom is as large as 250C. The effects of an 8-fold variation in kinematic viscosity are included. The critical Rayleigh number is found to be substantially reduced from the classical value although the associated wave number is nearly the same. Neutral mode streamline and isotherm patterns are considerably distorted in the vertical direction in distinction to the symmetric patterns found in the constant viscosity classical calculation.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- May 1975
- Bibcode:
- 1975STIN...7623533K
- Keywords:
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- Convective Heat Transfer;
- Fluid Flow;
- Porous Materials;
- Viscosity;
- Flow Resistance;
- Slabs;
- Temperature Gradients;
- Viscous Flow;
- Fluid Mechanics and Heat Transfer