What is the relation (f/2) Re = Nu = Sh known as? Under what conditions is it valid? What is the practical importance of it?
What will be an ideal response?
The relation f Re / 2= Nu = Sh is known as the Reynolds analogy. It is valid under the conditions that the Prandtl, Schmidt, and Lewis numbers are equal to units. That is, 
Reynolds analogy enables us to determine the seemingly unrelated friction, heat transfer, and mass transfer coefficients when only one of them is known or measured.
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What will be an ideal response?