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ME204 Final Exam - Heat Transfer
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ME204 Final Exam - Heat Transfer
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25 Questions

1. What is the Nusselt number?
2. Which of the following statements about radiation is false?
3. What is free convection?
4. Calculate heat loss due to radiation of a metal horizontal pipe with emissivity of 0.93. The temperature of the outer surface of the pipe is 560ºR. The temperatures of the walls and air in the room are 540ºR. The outer diameter of the pipe is 6 in.
5. What is the Prandtl number?
6. What is the range of heat transfer coefficient for forced convective boiling?
7. Heat loss due to radiation for a pipe is 30 kW.The temperature of the surrounding is 20°C. Estimate the temperature of the pipe.The pipe is 100 m long and its outer diameter is 10 cm.The surface emissivity of the pipe is 0.7.
8. What is the shape factor for conduction through wall of a thick cylinder with inner radius ri and outer radius ro?
9. What is the thermal resistance per unit area of heat convection with a heat transfer coefficient h?
10. Consider one-dimensional Cartesian steady-state conduction in a plane wall of thermal conductivity k. An internal heat source Q uniformly generates heat thorough the plane wall. What is the general solution of the temperature distribution?
11. Estimate the length of the thermal entrance region for water flow in a pipe.The diameter of the pipe is 10 cm.The Reynolds number of the flow is 500.
12. A 45 cm wire is used to boil water.The power of the wire is 1.25 kW.Its radius is 2 mm.The thermal conductivity of the wire material is 20 W/(m ∙ K).What is the difference between the temperature at the center of the wire and the temperature on the surface of the wire?
13. Heat can be transferred from one object to another by which process?
14. Which of the following boiling regime is characterized by a thin layer of vapor insulating the surface?
15. Which of the following equations represents Newton's law of cooling?
16. Consider one-dimensional Cartesian steady-state conduction in a plane wall of thermal conductivity k. An internal heat source Q uniformly generates heat thorough the plane wall. What is the general solution of the temperature distribution?
17. A plane wall of thickness L has thermal conductivity k. One side of the wall is cooled by a liquid with temperature T1 and heat transfer coefficient h1. The other side of the wall is heated by a gas with temperature T2 and heat transfer coefficient h2. What is the heat flux through the wall per unit area?
18. Estimate the temperature of the sun, if it can be approximated as a black body emitting radiation with a maximum intensity at ⎣ = 0.5 microns ( 5000 Aº).
19. What is the Grashof number?
20. For a fluid with Pr > 1, which of the following statements is true?
21. One face of a metal layer has a temperature of 50°C and the other face has a temperature of 30°C. The thickness of the metal layer is 100 mm. The thermal conductivity of the metal is 1W/°C ∙ m. What is the heat transfer per unit face area?
22. The Raleigh (Ra) number can be calculated from the Prandtl (Pr) and the Grashof (Gr) number as follows:
23. To solve a transient two-dimensional heat conduction problem, one needs to specify which of the following?
24. What are the two major forces that govern natural convection?
25. To solve a steady state two-dimensional heat conduction problem, one needs to specify which of the following?

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