Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning - Discussion

12. 

The heat transfer by conduction through a thick sphere is given by

[A].
[B].
[C].
[D].

Answer: Option B

Explanation:

No answer description available for this question.

Uppalapu Srinivas Raju said: (Aug 3, 2013)  
Consider the small spherical region with radius r2 inside the original sphere of radius r1. (r2<r1). Then from FOURIER's law of conduction, take the cross sectional area that is normal to radius (4*pi*r^2). Then by integration from r1 to r2 and T1 to T2. We will get the expression same where k is the thermal conductivity of the material.

Darshan Barot said: (Dec 29, 2015)  
Delta T/((1/2kl)* log(r1/r2)).

Where,
Delta T = Temperature difference.
K = Conductivity of material.
l = Length of material.
r1 & r2 = Inner and outer radii.

Is it right?

Akhil said: (Oct 7, 2018)  
This is for hollow sphere.

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