Heat Transfer
Analogy between mass and heat transfer is not applicable in case of

Viscous heating or chemical reaction
Thermal or pressure mass diffusion
Same velocity profile or equal eddy diffusivities
Both B and C

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Heat Transfer
In the equation Q = UAΔt; Δt is

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

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