When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is Correct Answer Mixed convection (both free and forced)

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The Grashoff number is defined as the ratio of the
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is