The present study evaluates the effects of a protruding heat sink located on one of the vertical walls of a cubic cavity, with a free convective laminar regimen. The best of three locations for the heat sink will be determined with the analysis of the velocity and temperature fields in the cavity. An optimal operation condition is required since the cavity will contain medical products with a specific temperature range. Three different locations for the heat sink, (in the +Y direction), are to be studied: 1/3 H, 1/2 H and 2/3 H, where H is the height of the cavity, for different values of Rayleigh Number 103<Ra<106. The heat exchange occurs between the heat sink and the isothermal walls. The results obtained show that it is recommended to place the heat sink at the position H/2, as the air had the best thermal and dynamic behavior.

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