Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is ____________________?
Correct answer: A. Thin walled having the value of Ao Ai/< 2
- A. Thin walled having the value of Ao Ai/< 2
- B. Thick walled
- C. Having the value of Ao/Ai > 2
- D. Both B. and C.
Explanation
For a thin-walled cylinder, the inner and outer areas are close enough that their arithmetic mean can represent the heat-transfer area. This approximation is commonly used when the area ratio Ao/Ai is less than about 2.
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