Publications [#245464] of Robert P. Behringer

Papers Published
  1. Wambaugh, JF; Behringer, RP, Asymmetry-induced circulation in granular hopper flows, in Powders and Grains, 2005, edited by R. Garcia-Rojo, and H. J. Herrmann, Powders and Grains 2005 - Proceedings of the 5th International Conference on Micromechanics of Granular Media, vol. 2 (2005), pp. 915-918, Balkema .

    The Jenike radial solutions have long been used to describe granular hopper flow by modeling particle paths as radial lines converging upon the vertex of a hopper. A finite-element simulation, based upon the Jenike solutions, has recently been developed and predicts that if the symmetry of the hopper is perturbed, a swirling, secondary-circulation flow arises in addition to the radial flow out of the hopper. (Gremaud et al. 2003) Additionally, increasing the roughness of the hopper walls is predicted to change the direction of this secondary-circulation and suppress its magnitude. Our experimental study tests for secondary-circulation in a hopper tilted to various angles, by tracking tracer grains within the flowing sand through windows in the side of the test hopper. Results indicate that perturbing the hopper by tilting with respect to gravity does indeed cause secondary-circulation. We do not, however, observe that varying the roughness of the hopper walls affects the secondary- circulation. © 2005 Taylor & Francis Group.