Publicação
Granular beds composed of different particle sizes: experimental and CFD approaches
| Resumo: | The porosity, tortuosity, permeability and heat exchange characteristics from binary packings, containing mixtures of small d and large D spherical particles, are analysed in the present work. Binary packing porosity (ε), tortuosity (τ), permeability and heat exchange performance are dependent on the volume fraction of large particles, xD, present in the mixtures, as well as on the particle size ratio, δ = d/D. In the region of minimum porosity from the binary mixtures (containing spheres with diameter d and D), heat exchange performance and permeability from binary packing are higher than that of the packing containing the small particles d alone (mono-size packing). The δ region where the permeability of binary packing is higher than the permeability of mono-size packing of particles d is located in the range 0.1 ≤ δ < 1.0. An increase in permeability by a factor of two is achieved for particle size ratios between 0.3 and 0.5. Tortuosity can be modelled by the simple function τ = 1/ε α and it is shown that, in the region of minimum porosity, α varies between 0.5 (mono-size packing) and 0.4 (binary packing with δ close to 0.03). Due to the tortuosity increase, binary mixtures give rise to Kozeny´s coefficients substantially higher than five. Using the commercial finite element software package POLYFLOW® it was possible to confirm the heat exchange enhancement referred above. The obtained improvement on the thermal performance is related to the increase of effective thermal conductivity in the binary packing and to the increase in transversal thermal conductivity due to the porosity decrease and tortuosity increase. For non-Newtonian fluids from the power-law type, τ decreases with the decrease of the flow index behaviour |
|---|---|
| Autores principais: | Dias, Ricardo P. |
| Outros Autores: | Fernandes, Carla S. |
| Assunto: | Tortuosity Permeability Porosity Binary packings Computational fluid dynamics |
| Ano: | 2009 |
| País: | Portugal |
| Tipo de documento: | capítulo de livro |
| Tipo de acesso: | acesso restrito |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| _version_ | 1867172680523841536 |
|---|---|
| author | Dias, Ricardo P. |
| author2 | Fernandes, Carla S. |
| author2_role | author |
| author_facet | Dias, Ricardo P. Fernandes, Carla S. |
| author_role | author |
| contributor_name_str_mv | Biblioteca Digital do IPB |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Dias, Ricardo P.\",\"Person.identifier.orcid\":\"0000-0003-1503-998X\"},{\"Person.name\":\"Fernandes, Carla S.\",\"Person.identifier.orcid\":\"0000-0002-3138-7493\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Biblioteca Digital do IPB |
| datacite.creators.creator.creatorName.fl_str_mv | Dias, Ricardo P. Fernandes, Carla S. |
| datacite.date.Accepted.fl_str_mv | 2009-01-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2011-06-02T13:56:36Z |
| datacite.date.embargoed.fl_str_mv | 2011-06-02T13:56:36Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_16ec |
| datacite.subjects.subject.fl_str_mv | Tortuosity Permeability Porosity Binary packings Computational fluid dynamics |
| datacite.titles.title.fl_str_mv | Granular beds composed of different particle sizes: experimental and CFD approaches |
| dc.contributor.none.fl_str_mv | Biblioteca Digital do IPB |
| dc.creator.none.fl_str_mv | Dias, Ricardo P. Fernandes, Carla S. |
| dc.date.Accepted.fl_str_mv | 2009-01-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2011-06-02T13:56:36Z |
| dc.date.embargoed.fl_str_mv | 2011-06-02T13:56:36Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10198/4923 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | Nova Publisher |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_16ec |
| dc.subject.none.fl_str_mv | Tortuosity Permeability Porosity Binary packings Computational fluid dynamics |
| dc.title.fl_str_mv | Granular beds composed of different particle sizes: experimental and CFD approaches |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_3248 |
| description | The porosity, tortuosity, permeability and heat exchange characteristics from binary packings, containing mixtures of small d and large D spherical particles, are analysed in the present work. Binary packing porosity (ε), tortuosity (τ), permeability and heat exchange performance are dependent on the volume fraction of large particles, xD, present in the mixtures, as well as on the particle size ratio, δ = d/D. In the region of minimum porosity from the binary mixtures (containing spheres with diameter d and D), heat exchange performance and permeability from binary packing are higher than that of the packing containing the small particles d alone (mono-size packing). The δ region where the permeability of binary packing is higher than the permeability of mono-size packing of particles d is located in the range 0.1 ≤ δ < 1.0. An increase in permeability by a factor of two is achieved for particle size ratios between 0.3 and 0.5. Tortuosity can be modelled by the simple function τ = 1/ε α and it is shown that, in the region of minimum porosity, α varies between 0.5 (mono-size packing) and 0.4 (binary packing with δ close to 0.03). Due to the tortuosity increase, binary mixtures give rise to Kozeny´s coefficients substantially higher than five. Using the commercial finite element software package POLYFLOW® it was possible to confirm the heat exchange enhancement referred above. The obtained improvement on the thermal performance is related to the increase of effective thermal conductivity in the binary packing and to the increase in transversal thermal conductivity due to the porosity decrease and tortuosity increase. For non-Newtonian fluids from the power-law type, τ decreases with the decrease of the flow index behaviour |
| dirty | 0 |
| eu_rights_str_mv | restrictedAccess |
| format | bookPart |
| fulltext.url.fl_str_mv | https://bibliotecadigital.ipb.pt/bitstreams/6fb84793-94da-4d90-8ee8-02d7b890c70e/download |
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| identifier.url.fl_str_mv | http://hdl.handle.net/10198/4923 |
| instacron_str | ipb |
| institution | Instituto Politécnico de Bragança |
| instname_str | Instituto Politécnico de Bragança |
| language | eng |
| network_acronym_str | ipb |
| network_name_str | Biblioteca Digital do IPB |
| oai_identifier_str | oai:bibliotecadigital.ipb.pt:10198/4923 |
| organization_str_mv | urn:organizationAcronym:ipb |
| person_str_mv | Dias, Ricardo P. Dias, Ricardo P. http://orcid.org/0000-0003-1503-998X 0000-0003-1503-998X Fernandes, Carla S. Fernandes, Carla S. https://www.ciencia-id.pt/F319-3D67-9DB7 F319-3D67-9DB7 http://orcid.org/0000-0002-3138-7493 0000-0002-3138-7493 |
| publishDate | 2009 |
| publisher.none.fl_str_mv | Nova Publisher |
| reponame_str | Biblioteca Digital do IPB |
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| spelling | engNova PublisherporThe porosity, tortuosity, permeability and heat exchange characteristics from binary packings, containing mixtures of small d and large D spherical particles, are analysed in the present work. Binary packing porosity (ε), tortuosity (τ), permeability and heat exchange performance are dependent on the volume fraction of large particles, xD, present in the mixtures, as well as on the particle size ratio, δ = d/D. In the region of minimum porosity from the binary mixtures (containing spheres with diameter d and D), heat exchange performance and permeability from binary packing are higher than that of the packing containing the small particles d alone (mono-size packing). The δ region where the permeability of binary packing is higher than the permeability of mono-size packing of particles d is located in the range 0.1 ≤ δ < 1.0. An increase in permeability by a factor of two is achieved for particle size ratios between 0.3 and 0.5. Tortuosity can be modelled by the simple function τ = 1/ε α and it is shown that, in the region of minimum porosity, α varies between 0.5 (mono-size packing) and 0.4 (binary packing with δ close to 0.03). Due to the tortuosity increase, binary mixtures give rise to Kozeny´s coefficients substantially higher than five. Using the commercial finite element software package POLYFLOW® it was possible to confirm the heat exchange enhancement referred above. The obtained improvement on the thermal performance is related to the increase of effective thermal conductivity in the binary packing and to the increase in transversal thermal conductivity due to the porosity decrease and tortuosity increase. For non-Newtonian fluids from the power-law type, τ decreases with the decrease of the flow index behaviourapplication/pdfporGranular beds composed of different particle sizes: experimental and CFD approachesPersonalDias, Ricardo P.DSpacehttp://dspace.org/items/5e7df3f1-9852-4d4b-8d5a-4e69eb79b164DSpacehttp://dspace.org/items/5e7df3f1-9852-4d4b-8d5a-4e69eb79b164DiasRicardo P.ORCIDhttp://orcid.org0000-0003-1503-998XScopus Author IDhttps://www.scopus.com7102885151PersonalFernandes, Carla S.DSpacehttp://dspace.org/items/8f9cf139-cfef-4025-ba87-56425618bc6eDSpacehttp://dspace.org/items/8f9cf139-cfef-4025-ba87-56425618bc6eFernandesCarla S.Ciência IDhttps://www.ciencia-id.ptF319-3D67-9DB7ORCIDhttp://orcid.org0000-0002-3138-7493Researcher IDhttps://www.researcherid.comA-4269-2015Scopus Author IDhttps://www.scopus.com8253740700HostingInstitutionOrganizationalBiblioteca Digital do IPBe-mailmailto:dspace@ipb.ptdspace@ipb.ptISBNIsPartOf978-1-60741-401-82011-06-02T13:56:36Z20092009-01-01T00:00:00ZHandlehttp://hdl.handle.net/10198/4923http://purl.org/coar/access_right/c_16ecrestricted accessTortuosityPermeabilityPorosityBinary packingsComputational fluid dynamics432027 bytesliteraturehttp://purl.org/coar/resource_type/c_3248book parthttp://purl.org/coar/access_right/c_16ecapplication/pdffulltexthttps://bibliotecadigital.ipb.pt/bitstreams/6fb84793-94da-4d90-8ee8-02d7b890c70e/downloadPorous Media: Heat and Mass Transfer, Transport and Mechanics151170New York, USA |
| spellingShingle | Granular beds composed of different particle sizes: experimental and CFD approaches Dias, Ricardo P. Tortuosity Permeability Porosity Binary packings Computational fluid dynamics |
| status | SINGLETON |
| subject.fl_str_mv | Tortuosity Permeability Porosity Binary packings Computational fluid dynamics |
| title | Granular beds composed of different particle sizes: experimental and CFD approaches |
| title_full | Granular beds composed of different particle sizes: experimental and CFD approaches |
| title_fullStr | Granular beds composed of different particle sizes: experimental and CFD approaches |
| title_full_unstemmed | Granular beds composed of different particle sizes: experimental and CFD approaches |
| title_short | Granular beds composed of different particle sizes: experimental and CFD approaches |
| title_sort | Granular beds composed of different particle sizes: experimental and CFD approaches |
| topic | Tortuosity Permeability Porosity Binary packings Computational fluid dynamics |
| topic_facet | Tortuosity Permeability Porosity Binary packings Computational fluid dynamics |
| url | http://hdl.handle.net/10198/4923 |
| visible | 1 |