Granular discharge rate for submerged hoppers
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 i...
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doaj-742cc9add2e94e148e0035d0a6f78c8f2020-11-24T20:59:35ZengPapers in PhysicsPapers in Physics1852-42491852-42492014-10-0160060009Granular discharge rate for submerged hoppersT. J. WilsonC. R. PfeiferN. MesyngierD. J. DurianThe 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. Received: 11 September 2014, Accepted: 10 October 2014; Reviewed by: L. Staron, CNRS, Universite Pierre et Marie Curie, Institut Le Rond d'Alembert, Paris, France; Edited by: L. A. Pugnaloni; DOI: http://dx.doi.org/10.4279/PIP.060009 Cite as: T J Wilson, C R Pfeifer, N Meysingier, D J Durian, Papers in Physics 6, 060009 (2014)http://www.papersinphysics.org/index.php/papersinphysics/article/view/212/pdf212Granular physicsBottlenecksClogging |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
T. J. Wilson C. R. Pfeifer N. Mesyngier D. J. Durian |
spellingShingle |
T. J. Wilson C. R. Pfeifer N. Mesyngier D. J. Durian Granular discharge rate for submerged hoppers Papers in Physics Granular physics Bottlenecks Clogging |
author_facet |
T. J. Wilson C. R. Pfeifer N. Mesyngier D. J. Durian |
author_sort |
T. J. Wilson |
title |
Granular discharge rate for submerged hoppers |
title_short |
Granular discharge rate for submerged hoppers |
title_full |
Granular discharge rate for submerged hoppers |
title_fullStr |
Granular discharge rate for submerged hoppers |
title_full_unstemmed |
Granular discharge rate for submerged hoppers |
title_sort |
granular discharge rate for submerged hoppers |
publisher |
Papers in Physics |
series |
Papers in Physics |
issn |
1852-4249 1852-4249 |
publishDate |
2014-10-01 |
description |
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.
Received: 11 September 2014, Accepted: 10 October 2014; Reviewed by: L. Staron, CNRS, Universite Pierre et Marie Curie, Institut Le Rond d'Alembert, Paris, France; Edited by: L. A. Pugnaloni; DOI: http://dx.doi.org/10.4279/PIP.060009
Cite as: T J Wilson, C R Pfeifer, N Meysingier, D J Durian, Papers in Physics 6, 060009 (2014) |
topic |
Granular physics Bottlenecks Clogging |
url |
http://www.papersinphysics.org/index.php/papersinphysics/article/view/212/pdf212 |
work_keys_str_mv |
AT tjwilson granulardischargerateforsubmergedhoppers AT crpfeifer granulardischargerateforsubmergedhoppers AT nmesyngier granulardischargerateforsubmergedhoppers AT djdurian granulardischargerateforsubmergedhoppers |
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