Heat Transfer
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

Nu = Gz
Nu = Gz
Nu = 2Gz0.5
Nu = 0.023 Re0.8 . Pr0.4

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Heat Transfer
In the equation Q = UAΔt; Δt is

The difference of average bulk temperatures of hot and cold fluids
Logarithmic mean temperature difference
Geometric mean temperature difference
Arithmetic mean temperature difference

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Heat Transfer
Prandtl number is the ratio of

Thermal diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity
Momentum diffusivity to mass diffusivity
Thermal diffusivity to momentum diffusivity

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