Wang, Junye, Christakis, Nicholas, Patel, Mayur K., Cross, Mark and Leaper, Mark C. (2004) A computational model of coupled heat and moisture transfer with phase change in granular sugar during varying environmental conditions. Numerical Heat Transfer, Part A: Applications, 45 (8). pp. 751-776. ISSN 1040-7782 (Print), 1521-0634 (Online) (doi:10.1080/10407780490424280)

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Abstract

As part of a comprehensive effort to predict the development of caking in granular materials, a mathematical model is introduced to model simultaneous heat and moisture transfer with phase change in porous media when undergoing temperature oscillations/cycling. The resulting model partial differential equations were solved using finite-volume procedures in the context of the PHYSICA framework and then applied to the analysis of sugar in storage. The influence of temperature on absorption/desorption and diffusion coefficients is coupled into the transport equations. The temperature profile, the depth of penetration of the temperature oscillation into the bulk solid, and the solids moisture content distribution were first calculated, and these proved to be in good agreement with experimental data. Then, the influence of temperature oscillation on absolute humidity, moisture concentration, and moisture migration for different parameters and boundary conditions was examined. As expected, the results show that moisture near boundary regions responds faster than farther away from them with surface temperature changes. The moisture absorption and desorption in materials occurs mainly near boundary regions (where interactions with the environment are more pronounced). Small amounts of solids moisture content, driven by both temperature and vapour concentration gradients, migrate between boundary and center with oscillating temperature.

Item Type:	Article
Additional Information:	[1] Accepted: October 2003. [2] Published in print: May 2004. [3] Full title of journal is: Numerical Heat Transfer, Part A: Applications. An International Journal of Computation and Methodology.
Uncontrolled Keywords:	computater modelling, coupled heat and moisture transfer, environmental conditions
Subjects:	Q Science > QA Mathematics > QA76 Computer software Q Science > QD Chemistry
Pre-2014 Departments:	School of Computing & Mathematical Sciences School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Mechanics & Reliability Group School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Science & Engineering Group School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Fire Safety Engineering Group School of Computing & Mathematical Sciences > Department of Mathematical Sciences
Related URLs:	Publisher Publisher Organisation
Last Modified:	14 Oct 2016 09:02
URI:	http://gala.gre.ac.uk/id/eprint/858

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