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Related Experiment Videos

Granular drag on a discrete object: shape effects on jamming.

I Albert1, J G Sample, A J Morss

  • 1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 12, 2001
PubMed
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We investigated drag force on objects in granular media. Object geometry has minimal impact, but depth dependence deviates from predictions, influenced by object shape.

Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Understanding forces on objects in granular media is crucial for various applications.
  • Previous studies focused on fluid drag, with less attention to granular medium complexities.

Purpose of the Study:

  • To quantify the drag force on objects with circular cross-sections moving through granular media.
  • To analyze the influence of object geometry and depth on drag force.

Main Methods:

  • Experimental setup involving slow movement of discrete objects through a spherical granular medium.
  • Systematic variation of object diameter and geometric factors.

Main Results:

  • Drag force scales quadratically with object diameter, consistent with theoretical expectations.

Related Experiment Videos

  • A deviation from linear depth dependence was observed.
  • The magnitude of this depth-dependent deviation is controlled by geometrical factors.

    • Conclusions:

    • Object geometry has a minor effect on drag force compared to shape effects in fluid drag.
    • The observed deviation in depth dependence highlights unique characteristics of granular media.
    • Further research into geometrical factors controlling this deviation is warranted.