A liquid diffusion model to describe drying of whole bananas using boundary-fitted coordinates

da Silva, Wilton Pereira and Hamawand, Ihsan and e Silva, Cleide M.D.P.S. (2014) A liquid diffusion model to describe drying of whole bananas using boundary-fitted coordinates. Journal of Food Engineering, 137. pp. 32-38. ISSN 0260-8774

Abstract

This article uses a liquid diffusion model to describe convective drying of whole bananas. The experiments were carried out with drying air temperatures at 40, 50, 60 and 70 degrees C. A two-dimensional numerical solution in generalized coordinates of the diffusion equation with boundary condition of the third kind, obtained through the finite volume method, was used to describe the process. A structured nonorthogonal grid was obtained by digitization of the photography of the fruit. In order to determine the thermo-physical properties, an optimizer was coupled with the numerical solution. The model proposed
in this article, which includes shrinkage and variable effective moisture diffusivity, well describes drying for all the experimental conditions, and makes it possible to predict the moisture distributions at any given time. The determination coefficients were greater than 0.99970 and the chi-squares were less than 8.33*10-4.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published Version restricted in accordance with copyright policy of publisher (Elsevier)
Faculty / Department / School: No Faculty
Date Deposited: 04 Sep 2014 06:49
Last Modified: 04 Jul 2016 06:18
Uncontrolled Keywords: generalized coordinates; irregular geometry; real geometry variable effective mass diffusivity; moisture distribution
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090403 Chemical Engineering Design
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8202 Horticultural Crops > 820214 Tropical Fruit
Identification Number or DOI: 10.1016/j.jfoodeng.2014.03.029
URI: http://eprints.usq.edu.au/id/eprint/25569

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