# Calculated thermal conductance for radial flow of a spherical sheel of inner and outer radius r_(1)and r_(2). Assume that thermal conductivity of

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Calculated thermal conductance for radial flow of a spherical sheel of inner and outer radius r_(1)and r_(2). Assume that thermal conductivity of the material is K

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Correct Answer - (4pikr_(1)r_(2))/((r_(2)-r_(1)))
int dR = overset(r_(2))underset(r_(1))int (dR)/(4pir^(2)k)

R = ((r_(2)-r_(1)))/(4pir_(1)r_(2)k)
G = (1)/(R ) = (4pi r_(1)r_(2)k)/((r_(2)-r_(1)))