  We study the injection of air in a granular suspension. We use a linear
Hele-Saw cell filled with a suspension which is displaced by air, leading to a
Saffman-Taylor (fingering) instability. For the suspension, we use an iso-dense
mixture where the fluid and the particles have the same density. The volume
fraction of particles can thus be adjusted over a wide range. We discuss the
question of an effective rheology inside the cell as well as the pattern
formation as a function of the granular compacity. We finally report results on
the finger width for stable fingers and the thresholds for their
destabilization.
