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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2012005570
pages 651-667

EFFECT OF POROSITY VARIATION IN DETERMINATION OF STAGNANT AND DISPERSION THERMAL CONDUCTIVITIES IN THE RESIN TRANSFER MOLDING PROCESS

Ali Nouri-Borujerdi
School of Mechanical Engineering, Sharif University of Technology, P. O.Box 11365-9567, Tehran, Iran; Dipartimento of Mechanical Engineering, Islamic Azad University, South Tehran Branch Tehran, Iran
Reza Rabani
Department of Mechanical Engineering, Tarbiat Modares University, South Tehran Branch, Tehran, Iran
M. J. Kermani
School of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran

RÉSUMÉ

A numerical analysis for determination of the stagnant and dispersion thermal conductivities in the Resin Transfer Molding (RTM) process is presented. A solution was obtained for the momentum and energy equations, which are used in this study and which represent the Brinkman−Forchheimer-extended Darcy model, and one-temperature energy equation. Subject to the appropriate boundary conditions, the governing equations are solved by the finite volume method on a collocated grid. In order to satisfy the pressure−velocity coupling in the solution, the SIMPLE algorithm was used and for determining the mass flux flowing past the cell faces, the Rhie−Chow interpolation was applied. Both constant and variable porosities near the channel wall were considered, so that the exact velocity distribution in a channel can be found. The numerical results for the temperature profile along with the centerline of the channel are fitted against available experimental data, and the effective thermal conductivity is obtained. Considering the quadratic relationship between the dispersion conductivity and Peclet number, the Chang model is proposed to predict the stagnant thermal conductivity as well as a correlation for the dispersion thermal conductivity.