final exam closed book

final exam closed book - s and cold water flowing at 8...

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CHEN- 3210 , Fall, 2010 Final Exam – Closed Book worth 15 pts Please print your name on this cover page and sign your name on this cover sheet as indicated below. Thanks. Good Luck!! Name _______________________________ Signature_____________________________
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1. If the spectral emissivity of a material increases with increasing wavelength, how does its total emissivity vary with temperature? 2. Consider the geometry below. Obtain an expression for the view factor of the groove with respect to the surroundings outside the groove. 3. In a counterflow heat exchanger, heat exchange occurs between hot water flowing at 2 kg/
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Unformatted text preview: s and cold water flowing at 8 kg/s. Which fluid will experience the largest temperature change? Why? 4. Consider an electrically heated wire. The heat generated by passing electrical current through the wire is constant. The wire has a plastic sheath that covers it; the outside surface of the sheath is exposed to ambient air. Compare the heat flux at the wire surface to that of the heat flux at the sheath surface and state why you answered that way....
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final exam closed book - s and cold water flowing at 8...

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