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Drying comparison of nonhygroscopic and hygroscopic materials

Harun, Zawati and Tze, Ching Ong and Ahmad, Rosli (2014) Drying comparison of nonhygroscopic and hygroscopic materials. Applied Mechanics and Materials, 456. pp. 637-641. ISSN 16627482

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Abstract

This paper investigates and presents the simulation of drying for hygroscopic and nonhygroscopic materials. This present work used a coupled mathematical model of mass, heat and gas transfer that implemented to finite element method in two dimensional and numerically compute using Skyline solver to capture highly nonlinear transient process. Bound water contribution was taken into account in the drying of hygroscopic materials by incorporating constitutive equation of bound water. The results showed drying process can be divided into three periods named constant rate period (CRP), first falling rate period (FRP1) and second falling rate period (FRP2). Capillary action is dominated during CRP before vapour diffusion takes place in FRP1. Bound water movement is generated by vapour pressure gradient exists that represent hygroscopic material.

Item Type: Article
Uncontrolled Keywords: nonhygroscopic; hygroscopic; bound water; convective drying
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Materials Engineering and Design
Depositing User: Normajihan Abd. Rahman
Date Deposited: 12 Jan 2017 02:53
Last Modified: 12 Jan 2017 02:53
URI: http://eprints.uthm.edu.my/id/eprint/8289
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