Department of Physics Papers

Document Type

Journal Article

Date of this Version

2014

Publication Source

Papers in Physics

Volume

6

Start Page

060009-1

Last Page

060009-7

DOI

10.4279/PIP.060009

Abstract

The discharge of spherical grains from a hole in the bottom of a right circular cylinder is measured with the entire system underwater. We find that the discharge rate depends on filling height, in contrast to the well-known case of dry non-cohesive grains. It is further surprising that the rate increases up to about twenty five percent, as the hopper empties and the granular pressure head decreases. For deep filling, where the discharge rate is constant, we measure the behavior as a function of both grain and hole diameters. The discharge rate scale is set by the product of hole area and the terminal falling speed of isolated grains. But there is a small-hole cutoff of about two and half grain diameters, which is larger than the analogous cutoff in the Beverloo equation for dry grains.

Copyright/Permission Statement

This article was originally published by Instituto de Fisica de Liquidos y Sistemas Biologicos. You can view the original work at http://www.papersinphysics.org/index.php/papersinphysics/article/view/212

Keywords

Granular physics, bottlenecks, clogging

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Date Posted:11 October 2017

This document has been peer reviewed.