What does the Nusselt modulus or Nusselt number physically signify? - Heat Transfer

Q.  What does the Nusselt modulus or Nusselt number physically signify?
- Published on 11 Aug 15

a. the ratio of the temperature gradient at the surface [(∂T / ∂y)y=0] to the reference temperature gradient [(Tw – T∞) / l]
b. the ratio of the reference temperature gradient [(Tw – T∞) / l] to the temperature gradient at the surface [(∂T / ∂y)y=0]
c. the sum of the temperature gradient at the surface [(∂T / ∂y)y=0] and the reference temperature gradient [(Tw – T∞) / l]
d. the sum of the reference temperature gradient [(Tw – T∞) / l] and the temperature gradient at the surface [(∂T / ∂y)y=0]

ANSWER: the ratio of the temperature gradient at the surface [(∂T / ∂y)y=0] to the reference temperature gradient [(Tw – T∞) / l]

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