Analysis of the interface conditions during drying of rice

The influence of the relative air humidity on the surface conditions of rice grain during drying was investigated. It was found that the equilibrium condition given by the desorption isotherm of the product is not valid over the whole range of relative humidity analysed. While this condition was ver...

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Autores principales: AGUERRE, R.J., SUÁREZ, C., VIOLLAZ, P.E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09505423_v19_n3_p315_AGUERRE
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09505423_v19_n3_p315_AGUERRE
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spelling todo:paper_09505423_v19_n3_p315_AGUERRE2023-10-03T15:50:13Z Analysis of the interface conditions during drying of rice AGUERRE, R.J. SUÁREZ, C. VIOLLAZ, P.E. The influence of the relative air humidity on the surface conditions of rice grain during drying was investigated. It was found that the equilibrium condition given by the desorption isotherm of the product is not valid over the whole range of relative humidity analysed. While this condition was verified with air of high relative humidity (between 43 and 59% for drying temperatures ranging from 40 to 70°C), the experimental results indicated that the surface moisture approaches the monolayer value given by the Brunauer, Emmett and Teller (BET) desorption isotherm when drying takes place with air of low relative humidity (7 and 14% for the same temperature range). An explanation of these facts is suggested taking into account the high value of the heat of desorption associated with the monolayer moisture content of the product under investigation. Finally, a method based on the Fick's second law solution when the time of drying becomes large enough is proposed to evaluate the surface moisture content of the grain independently of the conditions of the air drying. Copyright © 1984, Wiley Blackwell. All rights reserved Fil:AGUERRE, R.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09505423_v19_n3_p315_AGUERRE
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The influence of the relative air humidity on the surface conditions of rice grain during drying was investigated. It was found that the equilibrium condition given by the desorption isotherm of the product is not valid over the whole range of relative humidity analysed. While this condition was verified with air of high relative humidity (between 43 and 59% for drying temperatures ranging from 40 to 70°C), the experimental results indicated that the surface moisture approaches the monolayer value given by the Brunauer, Emmett and Teller (BET) desorption isotherm when drying takes place with air of low relative humidity (7 and 14% for the same temperature range). An explanation of these facts is suggested taking into account the high value of the heat of desorption associated with the monolayer moisture content of the product under investigation. Finally, a method based on the Fick's second law solution when the time of drying becomes large enough is proposed to evaluate the surface moisture content of the grain independently of the conditions of the air drying. Copyright © 1984, Wiley Blackwell. All rights reserved
format JOUR
author AGUERRE, R.J.
SUÁREZ, C.
VIOLLAZ, P.E.
spellingShingle AGUERRE, R.J.
SUÁREZ, C.
VIOLLAZ, P.E.
Analysis of the interface conditions during drying of rice
author_facet AGUERRE, R.J.
SUÁREZ, C.
VIOLLAZ, P.E.
author_sort AGUERRE, R.J.
title Analysis of the interface conditions during drying of rice
title_short Analysis of the interface conditions during drying of rice
title_full Analysis of the interface conditions during drying of rice
title_fullStr Analysis of the interface conditions during drying of rice
title_full_unstemmed Analysis of the interface conditions during drying of rice
title_sort analysis of the interface conditions during drying of rice
url http://hdl.handle.net/20.500.12110/paper_09505423_v19_n3_p315_AGUERRE
work_keys_str_mv AT aguerrerj analysisoftheinterfaceconditionsduringdryingofrice
AT suarezc analysisoftheinterfaceconditionsduringdryingofrice
AT viollazpe analysisoftheinterfaceconditionsduringdryingofrice
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