In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?
Correct answer: C. Logarithmic
- A. Geometric
- B. Arithmetic
- C. Logarithmic
- D. Either A., B. or C.
Explanation
Radial conduction through a cylinder varies with radius, so the appropriate area is based on the logarithmic mean radius or logarithmic mean area. Using an arithmetic or geometric mean area gives only an approximation.
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