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Convective and Microwave Assisted Drying of Wet Porous Materials with Prolate Spheroidal Shape: A Finite-Volume Approach

Edna G. Silva, Ricardo S. Gomez, Josivanda P. Gomes, Rossana M. F. Figueirêdo, Alexandre J. M. Queiroz, Wilton P. Silva, Ângela M. Santiago, Antonio D. B. Macedo, João P. L. Ferreira, Ítalo A. Gomes and Antonio G. B. Lima
Additional contact information
Edna G. Silva: Department of Physics, State University of Paraiba, Campina Grande 58429-500, Brazil
Ricardo S. Gomez: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Josivanda P. Gomes: Department of Agricultural Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Rossana M. F. Figueirêdo: Department of Agricultural Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Alexandre J. M. Queiroz: Department of Agricultural Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Wilton P. Silva: Department of Physics, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Ângela M. Santiago: Department of Chemical, State University of Paraiba, Campina Grande 58429-500, Brazil
Antonio D. B. Macedo: Department of Agricultural Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
João P. L. Ferreira: Department of Agricultural Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil
Ítalo A. Gomes: Center of Exact and Applied Social Sciences, State University of Paraiba, Patos 58706-550, Brazil
Antonio G. B. Lima: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande 58429-900, Brazil

Agriculture, 2020, vol. 10, issue 11, 1-17

Abstract: Convective heating is a traditional method used for the drying of wet porous materials. Currently, microwave drying has been employed for this purpose, due to its excellent characteristics of uniform moisture removal and heating inside the material, higher drying rate, and low energy demand. This paper focuses on the study of the combined convective and microwave drying of porous solids with prolate spheroidal shape. An advanced mathematical modeling based on the diffusion theory (mass and energy conservation equations) written in prolate spheroidal coordinates was derived and the numerical solution using the finite-volume method is presented. Here, we evaluated the effect of the heat and mass transport coefficients and microwave power intensity on the moisture removal and heating of the solid. Results of the drying and heating kinetics and the moisture and temperature distribution inside the solid are presented and discussed. It was verified that the higher the convective heat and mass transfer coefficients and microwave power intensity, the faster the solid will dry and heat up.

Keywords: drying; microwave; convective; prolate spheroid; simulation (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
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