Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NPr = NLe
NSc = NLe
NSc = 1
NSc = NPr = NLe

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Viscosity variation of the fluids may cause channeling/flooding
Pressure drop in the equipment will be very high
None of these
Packing may be crushed due to thermal expansion/contraction of the components of the equipments

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