Chemical Engineering Basics
Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as

Gr, Gr0.25
Gr0.25, Gr
Gr0.33, Gr0.25
Gr0.25, Gr0.33

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Chemical Engineering Basics
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type

Counter flow with unequal heat capacities
Parallel flow with equal heat capacities
Counter flow with equal heat capacities
Parallel flow with unequal heat capacities

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