Effective diffusivity in yacon potato cylinders during drying

• Autor(a) principal: Lisboa,Cícera G. C. de
• Data de Publicação: 2018
• Outros Autores: Gomes,Josivanda P., Figueirêdo,Rossana M. F. de, Queiroz,Alexandre J. de M., Diógenes,Adelino de M. G., Melo,João C. S. de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Brasileira de Engenharia Agrícola e Ambiental (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000800564
• topic: Smallanthus sonchifolia; mathematical modelling; diffusion

ABSTRACT The aim of this study was to obtain the effective diffusivity of yacon potato in fixed-bed dryer at different temperatures (50, 60 and 70 ºC) and drying air velocities (1.0, 1.5 and 2.0 m s-1). Non-linear regression analysis was performed by the Quasi-Newton method using the program Statistica 7.0, where the parameters of the models were estimated as a function of the drying air temperature. Approximation of Diffusion, Two Terms, Henderson & Pabis, and Page models fitted well the experimental data. Drying air temperature and speed influenced the drying time of the samples. The effective diffusivity increased with increasing temperature, ranging from 1.18 x 10-9 to 2.15 x 10-9 m2 s-1.