## Abstract

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}hprobe2 where the drag is related to the probe's depth of insertion, h_{probe}; the probe's diameter, d_{probe}; the grain material's density, ρ_{grain}; and a dimensionless constant, η. The dimensionless constant shows no systematic variation over four orders of magnitude in effective grain weight, demonstrating that the relation holds over that entire range to within the precision of our data.

Original language | English (US) |
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Article number | 011305 |

Journal | Physical Review E - Statistical, Nonlinear, and Soft Matter Physics |

Volume | 83 |

Issue number | 1 |

DOIs | |

State | Published - Jan 31 2011 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- Statistical and Nonlinear Physics
- Statistics and Probability
- Condensed Matter Physics