Evaluation of the spreading thermal resistance for rough spheres

Autores
Luzi, Carlos Daniel; Keegan, Sergio Dario; Mariani, Nestor Javier; Barreto, Guillermo Fernando
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The solid-solid contact of rough spherical particles in packed beds takes place by the deformation of individual asperities that transmit the stresses to the main body of the particles. This causes an elastically deformed area (a disk of radius a, most usually much smaller than the particle radius) enclosing the micro-contacts. Micro thermal resistances around the contact spots can be described in terms of a profile of thermal conductance h(r) that decreases toward the disk edge. An additional thermal resistance, the spreading resistance, is caused by the convergence of flux lines in the bulk of the spheres towards the reduced section of the disk. The described mechanism has been modeled by Bahrami et al. (2006) and a formulation was provided to predict the contribution of contact areas to the effective thermal conductivity. The spreading resistance Ωa is re-evaluated in this work on account of the h(r) profile, by means of numerical calculations. It is found that the shape of h(r) has a large impact on Ωa and a weaker, but still significant, effect on the overall contact resistance. The results of Ωa have been suitably correlated for a conductance profile of the form h(r) = h0 [1 - (r/a)2]p.
Fil: Luzi, Carlos Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Keegan, Sergio Dario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Mariani, Nestor Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Barreto, Guillermo Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Materia
Effective Thermal Conductivity
Overall Contact Resistance
Spreading Thermal Resistance
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/71247
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/71247
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Evaluation of the spreading thermal resistance for rough spheresLuzi, Carlos DanielKeegan, Sergio DarioMariani, Nestor JavierBarreto, Guillermo FernandoEffective Thermal ConductivityOverall Contact ResistanceSpreading Thermal Resistancehttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2https://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2The solid-solid contact of rough spherical particles in packed beds takes place by the deformation of individual asperities that transmit the stresses to the main body of the particles. This causes an elastically deformed area (a disk of radius a, most usually much smaller than the particle radius) enclosing the micro-contacts. Micro thermal resistances around the contact spots can be described in terms of a profile of thermal conductance h(r) that decreases toward the disk edge. An additional thermal resistance, the spreading resistance, is caused by the convergence of flux lines in the bulk of the spheres towards the reduced section of the disk. The described mechanism has been modeled by Bahrami et al. (2006) and a formulation was provided to predict the contribution of contact areas to the effective thermal conductivity. The spreading resistance Ωa is re-evaluated in this work on account of the h(r) profile, by means of numerical calculations. It is found that the shape of h(r) has a large impact on Ωa and a weaker, but still significant, effect on the overall contact resistance. The results of Ωa have been suitably correlated for a conductance profile of the form h(r) = h0 [1 - (r/a)2]p.Fil: Luzi, Carlos Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Keegan, Sergio Dario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Mariani, Nestor Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaFil: Barreto, Guillermo Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; ArgentinaPergamon-Elsevier Science Ltd2015-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/71247Luzi, Carlos Daniel; Keegan, Sergio Dario; Mariani, Nestor Javier; Barreto, Guillermo Fernando; Evaluation of the spreading thermal resistance for rough spheres; Pergamon-Elsevier Science Ltd; International Journal Of Heat And Mass Transfer; 86; 7-2015; 826-8310017-9310CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.ijheatmasstransfer.2015.03.048info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0017931015003063info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-11-05T09:40:06Zoai:ri.conicet.gov.ar:11336/71247instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-11-05 09:40:07.0CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Evaluation of the spreading thermal resistance for rough spheres
title Evaluation of the spreading thermal resistance for rough spheres
spellingShingle Evaluation of the spreading thermal resistance for rough spheres
Luzi, Carlos Daniel
Effective Thermal Conductivity
Overall Contact Resistance
Spreading Thermal Resistance
title_short Evaluation of the spreading thermal resistance for rough spheres
title_full Evaluation of the spreading thermal resistance for rough spheres
title_fullStr Evaluation of the spreading thermal resistance for rough spheres
title_full_unstemmed Evaluation of the spreading thermal resistance for rough spheres
title_sort Evaluation of the spreading thermal resistance for rough spheres
dc.creator.none.fl_str_mv Luzi, Carlos Daniel
Keegan, Sergio Dario
Mariani, Nestor Javier
Barreto, Guillermo Fernando
author Luzi, Carlos Daniel
author_facet Luzi, Carlos Daniel
Keegan, Sergio Dario
Mariani, Nestor Javier
Barreto, Guillermo Fernando
author_role author
author2 Keegan, Sergio Dario
Mariani, Nestor Javier
Barreto, Guillermo Fernando
author2_role author
author
author
dc.subject.none.fl_str_mv Effective Thermal Conductivity
Overall Contact Resistance
Spreading Thermal Resistance
topic Effective Thermal Conductivity
Overall Contact Resistance
Spreading Thermal Resistance
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The solid-solid contact of rough spherical particles in packed beds takes place by the deformation of individual asperities that transmit the stresses to the main body of the particles. This causes an elastically deformed area (a disk of radius a, most usually much smaller than the particle radius) enclosing the micro-contacts. Micro thermal resistances around the contact spots can be described in terms of a profile of thermal conductance h(r) that decreases toward the disk edge. An additional thermal resistance, the spreading resistance, is caused by the convergence of flux lines in the bulk of the spheres towards the reduced section of the disk. The described mechanism has been modeled by Bahrami et al. (2006) and a formulation was provided to predict the contribution of contact areas to the effective thermal conductivity. The spreading resistance Ωa is re-evaluated in this work on account of the h(r) profile, by means of numerical calculations. It is found that the shape of h(r) has a large impact on Ωa and a weaker, but still significant, effect on the overall contact resistance. The results of Ωa have been suitably correlated for a conductance profile of the form h(r) = h0 [1 - (r/a)2]p.
Fil: Luzi, Carlos Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Keegan, Sergio Dario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Mariani, Nestor Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Barreto, Guillermo Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco". Universidad Nacional de la Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
description The solid-solid contact of rough spherical particles in packed beds takes place by the deformation of individual asperities that transmit the stresses to the main body of the particles. This causes an elastically deformed area (a disk of radius a, most usually much smaller than the particle radius) enclosing the micro-contacts. Micro thermal resistances around the contact spots can be described in terms of a profile of thermal conductance h(r) that decreases toward the disk edge. An additional thermal resistance, the spreading resistance, is caused by the convergence of flux lines in the bulk of the spheres towards the reduced section of the disk. The described mechanism has been modeled by Bahrami et al. (2006) and a formulation was provided to predict the contribution of contact areas to the effective thermal conductivity. The spreading resistance Ωa is re-evaluated in this work on account of the h(r) profile, by means of numerical calculations. It is found that the shape of h(r) has a large impact on Ωa and a weaker, but still significant, effect on the overall contact resistance. The results of Ωa have been suitably correlated for a conductance profile of the form h(r) = h0 [1 - (r/a)2]p.
publishDate 2015
dc.date.none.fl_str_mv 2015-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/71247
Luzi, Carlos Daniel; Keegan, Sergio Dario; Mariani, Nestor Javier; Barreto, Guillermo Fernando; Evaluation of the spreading thermal resistance for rough spheres; Pergamon-Elsevier Science Ltd; International Journal Of Heat And Mass Transfer; 86; 7-2015; 826-831
0017-9310
CONICET Digital
CONICET
url http://hdl.handle.net/11336/71247
identifier_str_mv Luzi, Carlos Daniel; Keegan, Sergio Dario; Mariani, Nestor Javier; Barreto, Guillermo Fernando; Evaluation of the spreading thermal resistance for rough spheres; Pergamon-Elsevier Science Ltd; International Journal Of Heat And Mass Transfer; 86; 7-2015; 826-831
0017-9310
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ijheatmasstransfer.2015.03.048
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0017931015003063
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1847976937058729984
score 13.082534

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