Experimental and theoretical studies of the effects of buoyancy forces on liquid/liquid displacement processes in porous media.

Tianle. Guo
When a higher-viscosity fluid is displaced by a lower-viscosity fluid in a porous medium, the displacing fluid tends to channel through the paths of lesser hydrodynamic resistance, thereby forming pronounced "fingers". The effects of buoyancy (gravity) forces on the stability of such displacement processes are of considerable importance in many practical situations, especially during the recovery of oil from underground reservoirs, or during the clean-up of subterranean toxic chemical spills, by means of aqueous fluid...
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