Engineering, 06.07.2021 22:40 bellam302
The following is a correlation for the average Nusselt number for natural convection over spherical surface. As can be seen in the above, the Nusselt number approaches 2 as Rayleigh number approaches zero. Prove that this situation corresponds to conduction heat transfer and in conduction heat transfer over sphere, the Nusselt number becomes 2. Hint: First step: Write an expression for heat transfer between two spherical shells that share the same center. Second step: Assume the outer spherical shell is infinitely large.
Answers: 2
∞
ΔT--------(1)
ΔT
ΔT=h.4
ΔT
-------(4)
→0
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The following is a correlation for the average Nusselt number for natural convection over spherical...
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