MATHEMATICAL MODELING of TRANSIENT HEAT and MASS TRANSPORT IN A BAKING BISCUIT

Autor:	J. R. Heil, Mustafa Özilgen
Rok vydání:	1994
Předmět:	Convection Moisture Vapor pressure Chemistry General Chemical Engineering Diffusion Thermodynamics General Chemistry Mechanics Thermal conduction Mass transfer Heat transfer Anisotropy Food Science
Zdroj:	Journal of Food Processing and Preservation. 18:133-148
ISSN:	1745-4549 0145-8892
DOI:	10.1111/j.1745-4549.1994.tb00248.x
Popis:	Drying behavior of a single baking biscuit was modeled using unsteady state, anisotropic, two dimensional, simultaneous heat and mass balances. Solutions of these equations agreed well with the experimentally determined temperature and the moisture data. Modeling revealed that in the outer sections of the baking biscuit conduction and diffusion were the dominant heat and mass transfer mechanisms, respectively. In the central section of the biscuit the gas cells cracked with the increased vapor pressure and the upward volume expansion, then air/vapor enclaves were formed among the horizontal dough layers in the radial direction. the dominant heat and mass transfer mechanisms in the central section of the biscuit were convection. Presence of two different regime zones in a baking biscuit may have important consequences concerning the strength of the commercial products against crumbling during marketing and consumption.
Databáze:	OpenAIRE
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