A variable diffusivity model for the drying of spherical food particulates

Walker, Lauren & Senadeera, Wijitha (2013) A variable diffusivity model for the drying of spherical food particulates. In Grant, Stevens & Li, Qing (Eds.) 1st Australasian Conference on Computational Mechanics (ACCM2013), 3-4 October 2013, University of Sydney, Sydney, NSW.

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Abstract

An investigation of the drying of spherical food particles was performed, using peas as the model material. In the development of a mathematical model for drying curves, moisture diffusion was modelled using Fick’s second law for mass transfer. The resulting partial differential equation was solved using a forward-time central-space finite difference approximation, with the assumption of variable effective diffusivity. In order to test the model, experimental data was collected for the drying of green peas in a fluidised bed at three drying temperatures. Through fitting three equation types for effective diffusivity to the data, it was found that a linear equation form, in which diffusivity increased with decreasing moisture content, was most appropriate. The final model accurately described the drying curves of the three experimental temperatures, with an R2 value greater than 98.6% for all temperatures.

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ID Code: 65294
Item Type: Conference Item (Presentation)
Refereed: Yes
Additional URLs:
Keywords: drying, effective diffusivity, spherical, finite difference, mathematical model
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > FOOD SCIENCES (090800) > Food Engineering (090802)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 The Author(s)
Deposited On: 11 Dec 2013 23:26
Last Modified: 15 May 2014 09:17

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