Modelling of coupled heat and mass transfer for combined infrared and hot-air drying of sweet potato

Onwude, Daniel I. and Hashim, Norhashila and Abdan, Khalina and Janius, Rimfiel and Chen, Guangnan and Kumar, Chandan (2018) Modelling of coupled heat and mass transfer for combined infrared and hot-air drying of sweet potato. Journal of Food Engineering, 228. pp. 12-24. ISSN 0260-8774


This study aims to develop a numerical model to accurately predict moisture content and temperature distribution for sweet potato during combined infrared and hot-air drying (IR-HAD). The coupled heat and mass transfer during drying was simulated considering both temperature and shrinkage dependent diffusivity. The simultaneous heat and mass transfer model were solved using COMSOL Multiphysics, considering 2-D axisymmetric geometry. The IR energy input was determined by the Lambert's law. The simulation results were further evaluated based on data obtained from experiments conducted, showing that the model could adequately describe the coupled heat and mass transfer process of sweet potato during combined IR-HAD (R2 ¼ 0.986e0.996). The IR was also shown to be the most influential factor with regards to the heat transfer rate during the combined IR-HAD. The developed model can serve as a good basis for applications in other agricultural crops under different drying conditions.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Restricted access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 27 Mar 2018 03:05
Last Modified: 15 May 2018 00:52
Uncontrolled Keywords: drying; modelling; simulation; heat and mass transfer; sweet potato
Fields of Research : 09 Engineering > 0999 Other Engineering > 099901 Agricultural Engineering
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8203 Industrial Crops > 820399 Industrial Crops not elsewhere classified
Identification Number or DOI: 10.1016/j.jfoodeng.2018.02.006

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