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Calculate thermal conductance for radial...

Calculate thermal conductance for radial flow of an annular cylinder of length `l` and inner and outer radius `r_(1)` and `r_(2)`. Assume that thermal conductivity of the material is `K`

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The correct Answer is:
`(2pilK)/(ln(r_(2)//r_(1)))`
`int dR = overset(r_(2))underset(r_(1))int (dr)/(2pi rl k)`

Solving `R = (ln r_(2)//r_(1))/(2pilk) G = (1)/(R )`
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