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Heat Transfer Research
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ISSN Imprimir: 1064-2285
ISSN En Línea: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v39.i4.70
pages 347-370

Analysis of Frost Growth through a Two-Dimensional Duct with Turbulent Flow

Mehdi Salmanpour
Department of Mechanical Engineering, Azad Islamic University, Marvdasht Branch, Fars, Iran
O. Nourani Zonouz
Mechanical Engineering Department, Marvdasht Islamic Azad University, Fars, Iran
Mahmood A. Yaghoubi
School of Mechanical Engineering, Shiraz University, P. O. Box 71348-51154, Shiraz, Iran; Academy of Science, I.R. Iran

SINOPSIS

In this study, a numerical model based on the conservation equations of mass, momentum, energy, and species is developed to predict frost formation through a 2D cold duct with a fully turbulent flow of humid air. The physical domain is divided into two sub-domains: one for the humid air zone and another one for the frost layer. For immobilizing the movement of the frost surface, the governing equations were transferred to the computational domain and the resulted equations are discretized by the finite volume scheme. A turbulent flow is modeled by a low Reynolds number k−ε model. The frost zone is considered as a porous media and the density of the frost is considered to be non-homogenous. The effects of air relative humidity, flow Reynolds number, and plate temperature on frost formation were studied with respect to time in the fully developed duct. Based on the transient model, variation of the convection coefficient over the frost surface is plotted for different cooling periods. An attempt is made to develop a correlation to predict frost thickness as a function of air relative humidity, flow Reynolds number, mass transfer Fourier number, and temperature difference of humid air and cold wall temperature in the fully developed duct.


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