Abstract
The problem of viscous fingering in porous media is of central importance in oil recovery. It is also an interesting problem in hydrodynamics and in the physics of porous media. It has recently been shown that viscous fingering in porous media is fractal (Maloy et al., 1985a, b; Chen and Wilkinson, 1985). We begin with an introduction to the viscous fingering problem in a two-dimensional geometry, the Hele-Shaw cell, and present some of the relevant experimental results. We then present experimental results on fingering in porous media and discuss in particular the very recent evidence that the fingering is fractal.
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