For a liquid in laminar flow through a very long tube...

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For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

A. Nu = 0.023 Re^0.8.Pr^0.4

B. Nu = $$\frac{\pi }{2}$$ Gz

C. Nu = $$\frac{2}{\pi }$$ Gz

D. Nu = 2 Gz^0.5

Answer: Option C

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