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Heat Transfer Class 12th

Two thin metallic spherical shells of radii r1 and r2 (r1 < r2) are placed with their centres coinciding. A material of thermal conductivity K is filled in the space between the shells. The inner shell is maintained at temperature q1 and the outer shell at temperature q2(q1
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Vishal Baghel

Contributor-Level 10

Thermal resistance of spherical shell = r 2 − r 1 4 π K r 1 r 2  

Rate of heat flow = Δ T R = ( θ 2 − θ 1 ) ( r 2 − r 1 4 π K r 1 r 2 ) = 4 π K r 1 r 2 ( θ 2 − θ 1 ) ( r 2 − r 1 )

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