title: Granular drag on a discrete object: shape effects on jamming.
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.
authors.affiliation: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
authors.forename: I
authors.initials: I
authors.lastname: Albert
authors.forename: J G
authors.initials: JG
authors.lastname: Sample
authors.forename: A J
authors.initials: AJ
authors.lastname: Morss
authors.forename: S
authors.initials: S
authors.lastname: Rajagopalan
authors.forename: A L
authors.initials: AL
authors.lastname: Barabási
authors.forename: P
authors.initials: P
authors.lastname: Schiffer