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| Smaniotto,Thaís A. de S.; Resende,Osvaldo; Sousa,Kelly A. de; Oliveira,Daniel E. C. de; Campos,Rafael C.. |
| ABSTRACT The objectives of this study were to fit different mathematical models to experimental data of drying of sunflower grains, determine and evaluate the effective diffusion coefficient and obtain the activation energy for the process during the drying under various conditions of air. The sunflower grains were collected with an initial moisture content of 0.5267 dry basis (d.b.) and dried in an oven with forced air ventilation under five temperature conditions: 35, 50, 65, 80 and 95 °C, until reaching the moisture content of 0.0934 ± 0.0061 (d.b.). Among the analyzed models, Wang and Singh showed the best fit to describe the drying phenomenon. The effective diffusion coefficient of sunflower grains increased with the increment in air temperature and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mathematical modeling; Heliantus annus; Liquid diffusivity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000300203 |
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| Sousa,Kelly A. de; Resende,Osvaldo; Costa,Lílian M.. |
| Propôs-se, com este trabalho, determinar as isotermas de dessorção das sementes de nabo forrageiro e ajustar modelos matemáticos aos dados experimentais obtidos pelos métodos estático e dinâmico e verificar a possibilidade de utilização de um único modelo para ambos os métodos. Os teores de água de equilíbrio foram determinados pelo método dinâmico para as temperaturas de 25, 30, 35 e 40 ºC e atividades de água para cada temperatura, entre 0,27 a 0,82. No método estático foram utilizados dessecadores contendo as amostras e soluções salinas saturadas que foram colocadas em câmaras B.O.D. mantidas nas mesmas temperaturas. Aos dados experimentais foram ajustados modelos matemáticos disponíveis na literatura. Segundo os parâmetros estatísticos de análise, o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oleaginosa; Equilíbrio higroscópico; Modelagem matemática; Identidade de modelos. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013000200013 |
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| Barbosa,Karine F.; Sales,Juliana de F.; Resende,Osvaldo; Oliveira,Daniel E. C. de; Zuchi,Jacson; Sousa,Kelly A. de. |
| ABSTRACT The objective of this study was to determine the desorption isotherms of 'cajuzinho-do-cerrado' achenes (Anacardium humile St. Hil.) in various conditions of temperature and water activity, as well as to select the one that best represents the phenomenon and to determine the isosteric heat of desorption. The fruits were collected at the Emas National Park, in the municipality of Mineiros-GO, Brazil, pulped and then subjected to drying in silica gel at temperature of 25 ± 2 °C until the moisture contents of 17.6, 13.6, 11.1, 8.7 and 5.3 (d.b.%). After drying, the desorption isotherms were determined by the indirect static method. The water activity (Aw) was determined at different temperatures, and the achenes were placed in a B.O.D. chamber,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anacardium humile St. Hil.; Hygroscopicity; Water activity.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500481 |
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