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DOI: 10.1615/ICHMT.2009.CONV.1020
page 13

Mustapha Faraji
Cadi Ayyad University, Faculty of Sciences Semlalia, Department of Physics, Fluids Mechanic and Energetic laboratory, P.O. 2390, Marrakesh, Morocco

Hamid El Qarnia
Cadi Ayyad University, Faculty of Sciences Semlalia, Department of Physics, Fluid Mechanics and Energetic Laboratory (affiliated to CNRST, URAC 27), Marrakesh, Morocco

El Khadir Lakhal
Automatic, Environmental and Transfer Process Laboratory (Affiliate to CNRST, URAC 28) Marrakesh, Morocco


This work deals with the melting natural convection in a rectangular enclosure heated from three discreet protruding heat sources (electronic components) mounted on a conducting vertical wall (substrate). The heat sources generate heat at a constant and uniform volumetric rate. A part of the power generated in the heat sources is dissipated to PCM (n-eicosane with melting temperature, Tm=36°C) that filled the enclosure. To investigate the thermal behaviour of the proposed heat sink, a mathematical model based on the mass, momentum and energy conservation equations were developed. Next, a numerical investigations were conducted, in order to examine the effect of the heat sources thicknesses on their secured working time, τmax , and liquid fraction, fmax, for a given values of the rest of governing parameters. Correlations for the non-dimensional secured working time (time to reach the threshold temperature, Tcr=75°C) and the corresponding melt fraction were derived.

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