Low-velocity granular drag in reduced gravity.

@article{Costantino2011LowvelocityGD,
  title={Low-velocity granular drag in reduced gravity.},
  author={Daniel Costantino and Jennifer A. Bartell and Krysten Scheidler and Peter Schiffer},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2011},
  volume={83 1 Pt 1},
  pages={
          011305
        }
}
We probe the dependence of the low-velocity drag force in granular materials on the effective gravitational acceleration (g(eff)) through studies of spherical granular materials saturated within fluids of varying density. We vary g(eff) by a factor of 20, and we find that the granular drag is proportional to g(eff), i.e. that the granular drag, F(probe), on a vertical cylinder follows the expected relation F(probe)=ηρ(grain)g(eff)d(probe)h(probe)(2) where the drag is related to the probe's… 
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