Heat transfer in packed-beds of agricultural waste... - BV FAPESP
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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Casciatori, Fernanda Perpetua [1] ; Thomeo, Joao Claudio [2]
Total Authors: 2
Affiliation:
[1] Fed Univ Sao Carlos UFSCar, Chem Engn Dept, Rod Washington Luiz Km 235 SP 310, BR-13565905 Sao Carlos, SP - Brazil
[2] Sao Paulo State Univ UNESP, Food Engn & Technol Dept, Inst Biosci Letters & Exact Sci, Cristovao Colombo 2265, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Chemical Engineering Science; v. 188, p. 97-111, OCT 12 2018.
Web of Science Citations: 3
Abstract

Heat 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/d(p) = 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 degrees C and wall temperature 65 degrees C. The outlet bed temperatures (T-L) were measured by ring-shaped sensors and by aligned thermocouples. Average temperatures (T-avg) and global heat transfer coefficients (U) were calculated separately for central region of the beds and for wall-vicinity. Radial effective thermal conductivity (Lambda(r)) and wall-to-fluid convective heat transfer coefficient (alpha(wall)) 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 Lambda(r) and convective coefficient alpha(wall) increased with increasing air flow rate and decreased with bed height. Lambda(r) tended to the stagnant value of the thermal conductivity and alpha(wall) were lower than 50 W/m(2)/degrees C, addressing the difficulty on removing metabolic heat from PBs of SSF. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 14/25183-3 - Development and scaling-up of packed-bed bioreactors for cellulase production by solid-state fermentation
Grantee:Fernanda Perpétua Casciatori
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 12/13939-0 - Modeling of heat transfer and moisture migration in packed bed solid state fermentation bioreactors for fungal cellulase production using agro-industrial solid by-products
Grantee:Fernanda Perpétua Casciatori
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 14/23453-3 - Packed-bed solid-state fermentation bioreactor scale-up for cellulase production
Grantee:João Cláudio Thoméo
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 18/00996-2 - Development of a pseudo-continuous packed-bed bioreactor for solid-state fermentation
Grantee:Fernanda Perpétua Casciatori
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
FAPESP's process: 11/07453-5 - Fixed bed bioreactors to solid state fermentation: scale-up to cellullase fungal production
Grantee:Fernanda Perpétua Casciatori
Support Opportunities: Scholarships in Brazil - Doctorate