# PS7 - Problem Set 7 March 2012 MECH 375 Problem Set 7 Given...

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Problem Set # 7- March 2012 MECH 375 1 Problem Set # 7 Given: Friday, March. 02 Recommended Completion Date: Wednesday, March 07 Do not submit for grading Problem 1: Consider forced convection from a slender streamlined object in cross flow, as shown in the figure. The total surface area of the object is A s = 0.02 m 2 . The surface of the object is maintained at a constant temperature of T w = 75 C by means of electrical heating. The fluid temperature far from the object is also constant at T = 25 C . Experiments yield the following data on the free stream velocity, U , and the total rate of heat loss, q total : Run 1: U = 5 m/s; q total = 200 W Run 2: U = 24.02 m/s; q total = 600 W a) Calculate the heat transfer coefficient for Run 1 and Run 2. b) Calculate the total rate of heat loss from the object when U , = 13.46 m/s c) The following fluid properties are known: = 1 kg/m 3 ; c p = 1000 J/kg- C; k = 0.025 W/m- C. The total friction drag in Run 1 is found to be 0.01 N. Calculate the dynamic viscosity of the fluid.

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