Heat and Mass Transfer on the Microwave Drying of Rough Rice Grains: An Experimental Analysis

Edna G. Silva, Ricardo S. Gomez, Josivanda P. Gomes, Wilton P. Silva, Ketinlly Y. N. Porto, Fagno D. Rolim, João E. F. Carmo, Romário O. Andrade, Ivonete B. Santos, Rodrigo A. A. Sousa, Diego D. S. Diniz, Marcella M. C. A. Aragão and Antonio G. B. Lima
Additional contact information
Edna G. Silva: Department of Physics, State University of Paraiba, Campina Grande PB 58429-500, Brazil
Ricardo S. Gomez: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande PB 58429-900, Brazil
Josivanda P. Gomes: Department of Agricultural Engineering, Federal University of Campina Grande, Campina Grande PB 58429-900, Brazil
Wilton P. Silva: Department of Physics, Federal University of Campina Grande, Campina Grande PB 58429-900, Brazil
Ketinlly Y. N. Porto: Department of Civil Engineering, Federal University of Campina Grande, Campina Grande PB 58429-900, Brazil
Fagno D. Rolim: Teacher Training Center, Federal University of Campina Grande, Cajazeiras PB 58900-000, Brazil
João E. F. Carmo: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande PB 58429-900, Brazil
Romário O. Andrade: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande PB 58429-900, Brazil
Ivonete B. Santos: Department of Physics, State University of Paraiba, Campina Grande PB 58429-500, Brazil
Rodrigo A. A. Sousa: Teacher Training Center, Federal University of Campina Grande, Cajazeiras PB 58900-000, Brazil
Diego D. S. Diniz: Department of Engineering, Rural Federal University of Semi-Arid, Caraúbas RN 59780-000, Brazil
Marcella M. C. A. Aragão: Department of Chemical Engineering, Federal University of Campina Grande, Campina Grande PB 58429-900, Brazil
Antonio G. B. Lima: Department of Mechanical Engineering, Federal University of Campina Grande, Campina Grande PB 58429-900, Brazil

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

Abstract: This work aims to experimentally study the drying of agricultural products using microwaves, with particular reference to grains. Microwave drying experiments were carried out with paddy rice grains in natura (BRSMG Conai variety) for three levels of incident microwave power per mass of fresh grain (6.27, 14.63 and 22.99 W/g). Results of grain drying and heating kinetics are presented and analyzed. It was verified that the ideal average moisture content for grain storage and marketing, 15% (d.b.), occurred at 20 min (6.27 W/g), 13 min (14.63 W/g) and 7 min (22.99 W/g), and that the equilibrium moisture content of the samples reached 4.4%, 2.7% and 1.9%, at 310, 180 and 110 min, for each of the three power levels studied, respectively. The drying with the highest absorbed power caused discoloration of the grains at the end of the drying process.

Keywords: drying; microwave; paddy rice; heat; mass; experimental (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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