exam3 - ME 364: Elementary Heat Transfer Summer 2006...

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ME 364: Elementary Heat Transfer Summer 2006 Examination 3 Time: 75 minutes Total Points: 25 Open Book, Open Notes and Open Homework. No other printed/photocopied material. 1. (5 points) Experimental measurements of the convection heat transfer coefficient for a square bar in cross flow yielded the following values: (i) 1 - h = 50 W/m 2 -K when V 1 = 20 m/s, and (ii) 2 - h = 40 W/m 2 -K when V 2 = 15 m/s. Assume that the functional form of the Nusselt number is ( 29 n m C Nu (Pr) Re = - - , where C , m , and n are constants. (a) What will be the convection heat transfer coefficient for a similar bar but with L = 1 m when V = 15 m/s? (b) What will be the convection heat transfer flux from a similar bar but with L = 1 m when V = 30 m/s, if the bar surface average temperature is 50 o C and the free stream fluid temperature is 25 o C?
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2. (12 points) The roof of a refrigerated truck compartment is of composite construction, consisting of a layer of foamed urethane insulation ( t 2 = 50 mm, k i = 0.026 W/m-K)
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exam3 - ME 364: Elementary Heat Transfer Summer 2006...

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