The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.jnnfm.2017.07.001 http://hdl.handle.net/11449/163341 |
Resumo: | The so-called avalanche effect is one of the fingerprints of thixotropic materials. This self-reinforcing process where the decrease in viscosity, due to a rejuvenation process triggered by a stress field, induces a motion which in turn contributes to decrease the viscosity again, is well exemplified by the inclined plane problem. In this situation, the material in its fully-structured state is placed on an inclined plane with respect to the gravity force which is responsible for the beginning of the breakdown process. These thixotropic systems generally have a yield stress, a strength that must be overcome in order to induce rejuvenation. In addition, they exhibit elastic features, especially in the pre-yield state. In the present work we numerically solve the transient evolution of an elasto-viscoplastic thixotropic material subjected to the action of gravity on an inclined plane. In order to handle with the moving free-surface boundary condition encountered in the avalanche effect, we have used a combination of the Marker-And-Cell (MAC) method with the front-tracking scheme. This formulation was successfully employed for this kind of material in the recent paper of Oishi et al. (2016) [28]. In the present work, we have adapted our finite difference formulation to analyze the effects associated with an extended Herschel-Bulkley model in the simulation of a transient complex free surface flow. Concerning the parameters of the flow curve, it is shown that the dimensionless yield stress (plastic number) is the most significant one. However, for a fixed plastic number, different combinations of dimensionless consistency index and dimensionless Newtonian viscosity plateau can lead to a diversity of responses. The thixotropic equilibrium time had a significant impact on shifting the instant when the flow regime changes from an accelerating (when the front part of the material accelerates) to a retardation one (when this front part decelerates). Higher elasticity, as captured by the Weissenberg number, led to longer distances covered by the material. (C) 2017 Elsevier B.V. All rights reserved. |
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The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined planeElasto-viscoplastic thixotropic materialsAvalanche effectFinite difference Marker and Cell methodTransient computationsFree-surface boundary conditionsThe so-called avalanche effect is one of the fingerprints of thixotropic materials. This self-reinforcing process where the decrease in viscosity, due to a rejuvenation process triggered by a stress field, induces a motion which in turn contributes to decrease the viscosity again, is well exemplified by the inclined plane problem. In this situation, the material in its fully-structured state is placed on an inclined plane with respect to the gravity force which is responsible for the beginning of the breakdown process. These thixotropic systems generally have a yield stress, a strength that must be overcome in order to induce rejuvenation. In addition, they exhibit elastic features, especially in the pre-yield state. In the present work we numerically solve the transient evolution of an elasto-viscoplastic thixotropic material subjected to the action of gravity on an inclined plane. In order to handle with the moving free-surface boundary condition encountered in the avalanche effect, we have used a combination of the Marker-And-Cell (MAC) method with the front-tracking scheme. This formulation was successfully employed for this kind of material in the recent paper of Oishi et al. (2016) [28]. In the present work, we have adapted our finite difference formulation to analyze the effects associated with an extended Herschel-Bulkley model in the simulation of a transient complex free surface flow. Concerning the parameters of the flow curve, it is shown that the dimensionless yield stress (plastic number) is the most significant one. However, for a fixed plastic number, different combinations of dimensionless consistency index and dimensionless Newtonian viscosity plateau can lead to a diversity of responses. The thixotropic equilibrium time had a significant impact on shifting the instant when the flow regime changes from an accelerating (when the front part of the material accelerates) to a retardation one (when this front part decelerates). Higher elasticity, as captured by the Weissenberg number, led to longer distances covered by the material. (C) 2017 Elsevier B.V. All rights reserved.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Estadual Paulista Julio de Mesquite Filho, Fac Ciencias & Tecnol, Dept Matemat & Comp, BR-19060900 Sao Paulo, BrazilUniv Fed Rio de Janeiro, Ctr Tecnol, COPPE, Dept Mech Engn, BR-21945970 Rio De Janeiro, RJ, BrazilUniv Estadual Paulista Julio de Mesquite Filho, Fac Ciencias & Tecnol, Dept Matemat & Comp, BR-19060900 Sao Paulo, BrazilFAPESP: 2013/07375-0CNPq: 307459/2016-0CNPq: 309004/2014-4Elsevier B.V.Universidade Estadual Paulista (Unesp)Universidade Federal do Rio de Janeiro (UFRJ)Oishi, Cassio M. [UNESP]Martins, Fernando P. [UNESP]Thompson, Roney L.2018-11-26T17:41:03Z2018-11-26T17:41:03Z2017-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article165-177application/pdfhttp://dx.doi.org/10.1016/j.jnnfm.2017.07.001Journal Of Non-newtonian Fluid Mechanics. Amsterdam: Elsevier Science Bv, v. 247, p. 165-177, 2017.0377-0257http://hdl.handle.net/11449/16334110.1016/j.jnnfm.2017.07.001WOS:000412040900013WOS000412040900013.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal Of Non-newtonian Fluid Mechanics1,140info:eu-repo/semantics/openAccess2024-06-19T14:32:06Zoai:repositorio.unesp.br:11449/163341Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-06-19T14:32:06Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane |
title |
The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane |
spellingShingle |
The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane Oishi, Cassio M. [UNESP] Elasto-viscoplastic thixotropic materials Avalanche effect Finite difference Marker and Cell method Transient computations Free-surface boundary conditions |
title_short |
The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane |
title_full |
The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane |
title_fullStr |
The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane |
title_full_unstemmed |
The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane |
title_sort |
The avalanche effect of an elasto-viscoplastic thixotropic material on an inclined plane |
author |
Oishi, Cassio M. [UNESP] |
author_facet |
Oishi, Cassio M. [UNESP] Martins, Fernando P. [UNESP] Thompson, Roney L. |
author_role |
author |
author2 |
Martins, Fernando P. [UNESP] Thompson, Roney L. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Federal do Rio de Janeiro (UFRJ) |
dc.contributor.author.fl_str_mv |
Oishi, Cassio M. [UNESP] Martins, Fernando P. [UNESP] Thompson, Roney L. |
dc.subject.por.fl_str_mv |
Elasto-viscoplastic thixotropic materials Avalanche effect Finite difference Marker and Cell method Transient computations Free-surface boundary conditions |
topic |
Elasto-viscoplastic thixotropic materials Avalanche effect Finite difference Marker and Cell method Transient computations Free-surface boundary conditions |
description |
The so-called avalanche effect is one of the fingerprints of thixotropic materials. This self-reinforcing process where the decrease in viscosity, due to a rejuvenation process triggered by a stress field, induces a motion which in turn contributes to decrease the viscosity again, is well exemplified by the inclined plane problem. In this situation, the material in its fully-structured state is placed on an inclined plane with respect to the gravity force which is responsible for the beginning of the breakdown process. These thixotropic systems generally have a yield stress, a strength that must be overcome in order to induce rejuvenation. In addition, they exhibit elastic features, especially in the pre-yield state. In the present work we numerically solve the transient evolution of an elasto-viscoplastic thixotropic material subjected to the action of gravity on an inclined plane. In order to handle with the moving free-surface boundary condition encountered in the avalanche effect, we have used a combination of the Marker-And-Cell (MAC) method with the front-tracking scheme. This formulation was successfully employed for this kind of material in the recent paper of Oishi et al. (2016) [28]. In the present work, we have adapted our finite difference formulation to analyze the effects associated with an extended Herschel-Bulkley model in the simulation of a transient complex free surface flow. Concerning the parameters of the flow curve, it is shown that the dimensionless yield stress (plastic number) is the most significant one. However, for a fixed plastic number, different combinations of dimensionless consistency index and dimensionless Newtonian viscosity plateau can lead to a diversity of responses. The thixotropic equilibrium time had a significant impact on shifting the instant when the flow regime changes from an accelerating (when the front part of the material accelerates) to a retardation one (when this front part decelerates). Higher elasticity, as captured by the Weissenberg number, led to longer distances covered by the material. (C) 2017 Elsevier B.V. All rights reserved. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-09-01 2018-11-26T17:41:03Z 2018-11-26T17:41:03Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.jnnfm.2017.07.001 Journal Of Non-newtonian Fluid Mechanics. Amsterdam: Elsevier Science Bv, v. 247, p. 165-177, 2017. 0377-0257 http://hdl.handle.net/11449/163341 10.1016/j.jnnfm.2017.07.001 WOS:000412040900013 WOS000412040900013.pdf |
url |
http://dx.doi.org/10.1016/j.jnnfm.2017.07.001 http://hdl.handle.net/11449/163341 |
identifier_str_mv |
Journal Of Non-newtonian Fluid Mechanics. Amsterdam: Elsevier Science Bv, v. 247, p. 165-177, 2017. 0377-0257 10.1016/j.jnnfm.2017.07.001 WOS:000412040900013 WOS000412040900013.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal Of Non-newtonian Fluid Mechanics 1,140 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
165-177 application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1803650318382137344 |