JP Journal of Heat and Mass Transfer
Volume 4, Issue 1, Pages 1 - 15
(February 2010)
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EFFECTS OF AN INNER OBJECT ON NATURAL CONVECTIVE HEAT TRANSFER IN AN ENCLOSURE WITH A HEAT SOURCE ON THE BOTTOM WALL
Yuichi Funawatashi and Masaru Ishizuka
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Abstract: A numerical study of the effects of an inner object placed over a heat source at the center of the bottom wall of an enclosure on the natural convective heat transfer is presented. A good understanding of the heat transfer in an enclosure with such an arrangement is required for the thermal management of electronic devices. The results show that with the object wider than the heat source the flow pattern changes at a particular value of the Grashof number. At Grashof numbers lower than this particular value, flow develops mainly in the region over the object, and the flow under the object is so weak that the heat transfer is hindered, while at higher Grashof numbers, flow circulates through under the object, and the heat transfer reduction is diminished. In contrast, with the object narrower than the heat source, although the flow pattern changes, the corresponding change of the Nusselt number is insignificant. |
Keywords and phrases: natural convection, heat transfer, cavity, inner object, heat removal, electronic device. |
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