| Response to perturbations for granular flow in a hopper. | |
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MedLine Citation:
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PMID: 18233648 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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We experimentally investigate the response to perturbations of circular symmetry for dense granular flow inside a three-dimensional right-conical hopper. These experiments consist of particle tracking velocimetry for the flow at the outer boundary of the hopper. We are able to test commonly used constitutive relations and observe granular flow phenomena that we can model numerically. Unperturbed conical hopper flow has been described as a radial velocity field with no azimuthal component. Guided by numerical models based upon continuum descriptions, we find experimental evidence for secondary, azimuthal circulation in response to perturbation of the symmetry with respect to gravity by tilting. For small perturbations we can discriminate between constitutive relations, based upon the agreement between the numerical predictions they produce and our experimental results. We find that the secondary circulation can be suppressed as wall friction is varied, also in agreement with numerical predictions. For large tilt angles we observe the abrupt onset of circulation for parameters where circulation was previously suppressed. Finally, we observe that for large tilt angles the fluctuations in velocity grow, independent of the onset of circulation. |
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Authors:
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John F Wambaugh; Robert P Behringer; John V Matthews; Pierre A Gremaud |
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Publication Detail:
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Type: Journal Article Date: 2007-11-14 |
Journal Detail:
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Title: Physical review. E, Statistical, nonlinear, and soft matter physics Volume: 76 ISSN: 1539-3755 ISO Abbreviation: Phys Rev E Stat Nonlin Soft Matter Phys Publication Date: 2007 Nov |
Date Detail:
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Created Date: 2008-01-31 Completed Date: 2008-05-20 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101136452 Medline TA: Phys Rev E Stat Nonlin Soft Matter Phys Country: United States |
Other Details:
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Languages: eng Pagination: 051303 Citation Subset: - |
Affiliation:
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Department of Physics and Center for Nonlinear and Complex Systems, Duke University, Durham, North Carolina 27708, USA. wambaugh@phy.duke.edu |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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