Multiple choice

Consider a long cylindrical tube of inner and outer radii, ri and ro, respectively, length, L and thermal conductivity, k. Its inner and outer surfaces are maintained at Ti and To, respectively (Ti > To). Assuming one-dimensional steady state heat conduction in the radial direction, the thermal resistance in the wall of the tube is

  1. $\frac{1}{2 \pi KL}1n \Big( \frac{r_i}{r_o} \Big)$
  2. $\frac{1}{2 \pi r_iL}$
  3. $\frac{1}{2 \pi KL}1n \Big( \frac{r_o}{r_i} \Big)$
  4. $\frac{1}{4 \pi KL}1n \Big( \frac{r_o}{r_i} \Big)$
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C Correct answer
Explanation

Correct option is (3).

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