Heat transfer in packed-beds of agricultural waste with low rates of air flow applicable to solid-state fermentation

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dc.contributor.authorCasciatori, Fernanda Perpétua
dc.contributor.authorThoméo, João Cláudio [UNESP]
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2018-12-11T17:37:28Z
dc.date.available2018-12-11T17:37:28Z
dc.date.issued2018-10-12
dc.description.abstractHeat transfer studies were carried out in packed-beds (PBs) heated by the wall and percolated by low air flow rates. Porous media were composed by particles of sugarcane bagasse (SCB) and by a mixture of particles of SCB, orange pulp and peel (OPP) and wheat bran (WB) at proportion SCB:OPP:WB 1:2:2 w/w (composed medium), agricultural waste used as substrates in bioreactors of solid-state fermentation (SSF), an interesting biotechnological application of PBs. Once metabolic heat generated has to be dissipated, heat transfer studies and thermal parameters are required. Tube-to-particle diameter ratio was D/dp = 260, bed height ranged from L = 60 to 180 mm, while air flow rate ranged from 400 to 1200 L/h. Air temperature was 40 °C and wall temperature 65 °C. The outlet bed temperatures (TL) were measured by ring-shaped sensors and by aligned thermocouples. Average temperatures (Tavg) and global heat transfer coefficients (U) were calculated separately for central region of the beds and for wall-vicinity. Radial effective thermal conductivity (Λr) and wall-to-fluid convective heat transfer coefficient (αwall) have been estimated by means of the traditional two-parameters model. Radial temperature profiles at bed outlet were flattened in the central region and convergent at the edge of the packs. The two-regions approximation for U calculations showed to be appropriate for both packs. Global coefficient U, thermal conductivity Λr and convective coefficient αwall increased with increasing air flow rate and decreased with bed height. Λr tended to the stagnant value of the thermal conductivity and αwall were lower than 50 W/m2/°C, addressing the difficulty on removing metabolic heat from PBs of SSF.en
dc.description.affiliationChemical Engineering Department Federal University of São Carlos (UFSCar), Rod. Washington Luiz km 235 SP 310, Bairro Monjolinho
dc.description.affiliationFood Engineering and Technology Department Institute of Biosciences Letters and Exact Sciences São Paulo State University (UNESP), Cristóvão Colombo 2265, Jardim Nazareth
dc.description.affiliationUnespFood Engineering and Technology Department Institute of Biosciences Letters and Exact Sciences São Paulo State University (UNESP), Cristóvão Colombo 2265, Jardim Nazareth
dc.format.extent97-111
dc.identifierhttp://dx.doi.org/10.1016/j.ces.2018.05.024
dc.identifier.citationChemical Engineering Science, v. 188, p. 97-111.
dc.identifier.doi10.1016/j.ces.2018.05.024
dc.identifier.file2-s2.0-85048706384.pdf
dc.identifier.issn0009-2509
dc.identifier.scopus2-s2.0-85048706384
dc.identifier.urihttp://hdl.handle.net/11449/179960
dc.language.isoeng
dc.relation.ispartofChemical Engineering Science
dc.relation.ispartofsjr1,043
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectBioreactors
dc.subjectHeat transfer
dc.subjectPacked-beds
dc.subjectSolid waste
dc.subjectSolid-state fermentation
dc.titleHeat transfer in packed-beds of agricultural waste with low rates of air flow applicable to solid-state fermentationen
dc.typeArtigo

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Artigos - Engenharia e Tecnologia de Alimentos - IBILCE