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final exam open book

# final exam open book - T 210.1 4 T 10 qdot h 1s,i T m)18C...

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.18 ε λ .1 λ ( μ m) 10 h 1 , T ,1 q dot = 2 X 10 4 T s,o T s,i CHEN- 3210 , Fall, 2010 Final Exam – Open Book Please put your name on each page and separate the three problems. Name _______________________________ Signature_____________________________

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1. A horizontal cylinder with a diameter of 2 cm is located in a large black enclosure maintained at 5 C. Surrounding the cylinder is 40 C stagnant air. If the surface temperature of the cylinder is 350 C and thermal energy is generated uniformly within the cylinder at a rate of 800 W, what is the length of the cylinder? The spectrum for ε λ is shown below. (20 pts) α = 38.3 X 10 -6 m 2 /s = ν 26.4 X 10 -6 m 2 /s k = 0.0338 W/m-K Pr = .69
2. Heat is uniformly generated at the rate of 2 X 10 5 W/m 3 in a wall of thermal conductivity 25 W/m-K and thickness 60 mm. The square wall (0.25m on a side) is exposed to convection on both sides, with the necessary heat transfer coefficient and temperature as indicated. There are 30 straight rectangular fins on the right hand side of the wall with dimensions as

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final exam open book - T 210.1 4 T 10 qdot h 1s,i T m)18C...

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