Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears

Detalhes bibliográficos
Autor(a) principal: Guiné, Raquel
Data de Publicação: 2013
Outros Autores: Barroca, Maria João
Idioma: eng
Título da fonte: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
Texto Completo: http://hdl.handle.net/10400.19/1767
Resumo: Portugal is a tropical country with a long tradition of drying fruits, among which stand the pears. The design of the proper operating conditions relies on the knowledge of the transfer phenomena happening during drying. Hence, the present work aimed at determining the mass transfer properties of pears for convective air drying, based on the diffusion model. The values of the diffusion and mass transfer coefficients for the drying of pears of the variety D. Joaquina were determined for two drying temperatures, 60 ºC and 70 ºC, and the results obtained showed an increase of 38 % in diffusivity and an even more pronounced increase in the mass transfer coefficient, 56 %. Regarding the dimensionless numbers, Biot number ncreased 13 % while Dincer number decrease 28 %.
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spelling Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina PearsPearDissusivityDryingMathematical Modelmass transfer coefficientPortugal is a tropical country with a long tradition of drying fruits, among which stand the pears. The design of the proper operating conditions relies on the knowledge of the transfer phenomena happening during drying. Hence, the present work aimed at determining the mass transfer properties of pears for convective air drying, based on the diffusion model. The values of the diffusion and mass transfer coefficients for the drying of pears of the variety D. Joaquina were determined for two drying temperatures, 60 ºC and 70 ºC, and the results obtained showed an increase of 38 % in diffusivity and an even more pronounced increase in the mass transfer coefficient, 56 %. Regarding the dimensionless numbers, Biot number ncreased 13 % while Dincer number decrease 28 %.Instituto Politécnico de ViseuGuiné, RaquelBarroca, Maria João2013-07-29T13:56:36Z20132013-01-01T00:00:00Zconference objectinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10400.19/1767enginfo:eu-repo/semantics/openAccessreponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiainstacron:RCAAP2025-03-06T14:04:18Zoai:repositorio.ipv.pt:10400.19/1767Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireinfo@rcaap.ptopendoar:https://opendoar.ac.uk/repository/71602025-05-29T00:14:54.262722Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologiafalse
dc.title.none.fl_str_mv Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears
title Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears
spellingShingle Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears
Guiné, Raquel
Pear
Dissusivity
Drying
Mathematical Model
mass transfer coefficient
title_short Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears
title_full Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears
title_fullStr Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears
title_full_unstemmed Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears
title_sort Estimation of the Diffusivities and Mass Transfer Coefficients for the Drying of D. Joaquina Pears
author Guiné, Raquel
author_facet Guiné, Raquel
Barroca, Maria João
author_role author
author2 Barroca, Maria João
author2_role author
dc.contributor.none.fl_str_mv Instituto Politécnico de Viseu
dc.contributor.author.fl_str_mv Guiné, Raquel
Barroca, Maria João
dc.subject.por.fl_str_mv Pear
Dissusivity
Drying
Mathematical Model
mass transfer coefficient
topic Pear
Dissusivity
Drying
Mathematical Model
mass transfer coefficient
description Portugal is a tropical country with a long tradition of drying fruits, among which stand the pears. The design of the proper operating conditions relies on the knowledge of the transfer phenomena happening during drying. Hence, the present work aimed at determining the mass transfer properties of pears for convective air drying, based on the diffusion model. The values of the diffusion and mass transfer coefficients for the drying of pears of the variety D. Joaquina were determined for two drying temperatures, 60 ºC and 70 ºC, and the results obtained showed an increase of 38 % in diffusivity and an even more pronounced increase in the mass transfer coefficient, 56 %. Regarding the dimensionless numbers, Biot number ncreased 13 % while Dincer number decrease 28 %.
publishDate 2013
dc.date.none.fl_str_mv 2013-07-29T13:56:36Z
2013
2013-01-01T00:00:00Z
dc.type.driver.fl_str_mv conference object
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.19/1767
url http://hdl.handle.net/10400.19/1767
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
instname:FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron:RCAAP
instname_str FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
instacron_str RCAAP
institution RCAAP
reponame_str Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
collection Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
repository.name.fl_str_mv Repositórios Científicos de Acesso Aberto de Portugal (RCAAP) - FCCN, serviços digitais da FCT – Fundação para a Ciência e a Tecnologia
repository.mail.fl_str_mv info@rcaap.pt
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