For heat flow through very thick walled cylinder, use ___________mean radius?
Correct answer: B. Logarithmic
- A. Arithmetic
- B. Logarithmic
- C. Geometric
- D. Either A. or C.
Explanation
For radial conduction through a cylinder, area changes with radius, so the exact resistance contains ln(r2/r1). Representing the wall with a mean radius therefore requires the logarithmic mean radius, not the arithmetic or geometric mean.
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