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The Rolling Transition in a Granular Flow along a Rotating Wall

The flow of a dry granular material composed of spherical particles along a rotating boundary has been studied by the discrete element method (DEM). This type of flow is used, among others, as a process to spread particles. The flow consists of several phases. A compression phase along the rotating...

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Autores principales: Rioual, Francois, Le Quiniou, Aurélie, Lapusta, Yuri
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5448853/
https://www.ncbi.nlm.nih.gov/pubmed/28824120
http://dx.doi.org/10.3390/ma4112003
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author Rioual, Francois
Le Quiniou, Aurélie
Lapusta, Yuri
author_facet Rioual, Francois
Le Quiniou, Aurélie
Lapusta, Yuri
author_sort Rioual, Francois
collection PubMed
description The flow of a dry granular material composed of spherical particles along a rotating boundary has been studied by the discrete element method (DEM). This type of flow is used, among others, as a process to spread particles. The flow consists of several phases. A compression phase along the rotating wall is followed by an elongation of the flow along the same boundary. Eventually, the particles slide or roll independently along the boundary. We show that the main motion of the flow can be characterized by a complex deformation rate of traction/compression and shear. We define numerically an effective friction coefficient of the flow on the scale of the continuum and show a strong decrease of this effective friction beyond a certain critical friction coefficient μ*. We correlate this phenomenon with the apparition of a new transition from a sliding regime to a rolling without sliding regime that we called the rolling transition; this dynamic transition is controlled by the value of the friction coefficient between the particle and the wall. We show that the spherical shape for the particles may represent an optimum for the flow in terms of energetic.
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spelling pubmed-54488532017-07-28 The Rolling Transition in a Granular Flow along a Rotating Wall Rioual, Francois Le Quiniou, Aurélie Lapusta, Yuri Materials (Basel) Article The flow of a dry granular material composed of spherical particles along a rotating boundary has been studied by the discrete element method (DEM). This type of flow is used, among others, as a process to spread particles. The flow consists of several phases. A compression phase along the rotating wall is followed by an elongation of the flow along the same boundary. Eventually, the particles slide or roll independently along the boundary. We show that the main motion of the flow can be characterized by a complex deformation rate of traction/compression and shear. We define numerically an effective friction coefficient of the flow on the scale of the continuum and show a strong decrease of this effective friction beyond a certain critical friction coefficient μ*. We correlate this phenomenon with the apparition of a new transition from a sliding regime to a rolling without sliding regime that we called the rolling transition; this dynamic transition is controlled by the value of the friction coefficient between the particle and the wall. We show that the spherical shape for the particles may represent an optimum for the flow in terms of energetic. MDPI 2011-11-11 /pmc/articles/PMC5448853/ /pubmed/28824120 http://dx.doi.org/10.3390/ma4112003 Text en © 2011 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Rioual, Francois
Le Quiniou, Aurélie
Lapusta, Yuri
The Rolling Transition in a Granular Flow along a Rotating Wall
title The Rolling Transition in a Granular Flow along a Rotating Wall
title_full The Rolling Transition in a Granular Flow along a Rotating Wall
title_fullStr The Rolling Transition in a Granular Flow along a Rotating Wall
title_full_unstemmed The Rolling Transition in a Granular Flow along a Rotating Wall
title_short The Rolling Transition in a Granular Flow along a Rotating Wall
title_sort rolling transition in a granular flow along a rotating wall
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5448853/
https://www.ncbi.nlm.nih.gov/pubmed/28824120
http://dx.doi.org/10.3390/ma4112003
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