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Granular Drag on a Discrete Object: Shape Effects on Jamming

I. Albert·J. G. Sample·A. J. Morss·S. Rajagopalan·A. -L. Barabasi·P. Schiffer
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Abstract

We study the drag force on discrete objects with circular cross section moving slowly through a spherical granular medium. Variations in the geometry of the dragged object change the drag force only by a small fraction relative to shape effects in fluid drag. The drag force depends quadratically on the object's diameter as expected. We do observe, however, a deviation above the expected linear depth dependence, and the magnitude of the deviation is apparently controlled by geometrical factors.

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I. Albert, J. G. Sample, A. J. Morss, S. Rajagopalan, A. -L. Barabasi, P. Schiffer. 2001-07-19. Granular Drag on a Discrete Object: Shape Effects on Jamming. https://doi.org/10.1103/physreve.64.061303

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