ME314 Exam #2 _09..Fall_

# ME314 Exam #2 _09..Fall_ - ME 314 Introduction to Heat...

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ME 314: Introduction to Heat Transfer Exam #2: Nov 18 (Wed), 2009 Instructor: Prof. Kwang J. Kim ____________________________________________________________________________________ ME314 Exam #2 (09. .Fall).docx Name: ______________________ Student ID: _______________________________ (1) An array of eight aluminum alloy fins, each 3 mm wide, 0.4 mm thick, and 40 mm long, is used to cool a transistor. When the base is at 340K and the ambient air is at 300K, how much power do they dissipate if the combined convection and radiation hear transfer coefficient is estimated to be 8 W/m 2 K? The alloy has a conductivity of 175 W/m-K.

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ME 314: Introduction to Heat Transfer Exam #2: Nov 18 (Wed), 2009 Instructor: Prof. Kwang J. Kim ____________________________________________________________________________________ ME314 Exam #2 (09. .Fall).docx 2) A steady state, finite-difference analysis has been performed on a cylindrical fin with a diameter of 12 mm and a thermal conductivity of 20 W/m-K. The convection process is characterized by a fluid
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ME314 Exam #2 _09..Fall_ - ME 314 Introduction to Heat...

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