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Heat Transfer Research
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ISSN Print: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2011002174
pages 415-432

A Theoretical Model for Unsteady Coupled Heat and Mass Transfer Phenomena in Industrial Dryers

Hossein Shokouhmand
University of Tehran
Sajjad Bigham
School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
Sajjad Yazdani
School of Energy, Kermanshah University of Technology, Kermanshah, Iran

ABSTRACT

An analytical method is proposed to investigate the combined heat and mass transfer phenomena taking place in industrial dryers. The unsteady heat and mass transfer equations are solved analytically to obtain the distributions of the fluid and solid temperatures and the solid humidity. At the fluid and solid interface, due to the temperature and concentration gradients in the fluid and in the solid, the governing equations are coupled. One of the principal aims of the current research is to propose an analytical method for estimation of the required time for drying of a solid material. For the case of e = 0.03 and δ = 0.09, the results show that the solid is dried in approximately 25 min while for the case of e = 0.5 and δ = 1.5, the required time of drying is almost 600 min.


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