Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 21 Jan 2018 My Price 8.00

aluminum heat sink

Repeat Prob. 7–26 assuming the heat sink to be blackanodized and thus to have an effective emissivity of 0.90. Note that in radiation calculations the base area (10 cm 3 6.2 cm) is to be used, not the total surface area.

Prob

A transformer that is 10 cm long, 6.2 cm wide, and 5 cm high is to be cooled by attaching a 10-cm x 6.2-cm-wide polished aluminum heat sink (emissivity = 0.03) to its top surface. The heat sink has seven fins, which are 5 mm high, 2 mm thick, and 10 cm long. A fan blows air at 258C parallel to the passages between the fins. The heat sink is to dissipate 12 W of heat and the base temperature of the heat sink is not to exceed 60°C. Assuming the fins and the base plate to be nearly isothermal and the radiation heat transfer to be negligible, determine the minimum free-stream velocity the fan needs to supply to avoid overheating. Assume the flow is laminar over the entire finned surface of the transformer

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Maurice Tutor
(5)
Status NEW Posted 21 Jan 2018 10:01 PM My Price 8.00

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