Solar drying of guavas, papayas and apples

Hawlader, Mohammad Nurul Alam and Lee, Hwee Peng (2011) Solar drying of guavas, papayas and apples. In: Alternative energy. IIUM Press, Kuala Lumpur, pp. 38-46. ISBN 9789674181581

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Abstract

This paper includes the results of a study carried out to determine the drying characteristics of three agricultural fruit products. The products used in this analysis were apples, guavas and papayas. The drying characteristics of the three products were investigated under different operating conditions by varying now velocities and the thickness of the specimens. An experimental solar dryer was built to conduct tests on different samples. Tests were carried under both natural and forced convection conditions. Different meteorological conditions were considered in the experiments. A analytical model. based on Fick's second law of diffusion. was used to determine the effective diffusion coefficients of the three products. The diffusion coefficients were obtained from the slope of in (w/wo) against t/L2. It was found that the diffusivities of apples, guavas and papayas range between 5.74xI0-12 and 8.6IxI0-IO 1112/s. It was also observed that shrinkage occurred in the above three specimens during drying. This effect was taken into account and a correction factor for thickness, L, was introduced.

Item Type:	Book Chapter
Additional Information:	6548/20053
Uncontrolled Keywords:	Solar drying
Subjects:	T Technology > TP Chemical technology > TP368 Food processing and manufacture
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof Mohammad Nurul Alam / M N A Hawlader
Date Deposited:	31 May 2012 14:34
Last Modified:	31 May 2012 14:37
URI:	http://irep.iium.edu.my/id/eprint/20053

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