Mass Transfer
In physical terms, Schmidt number means

Mass diffusivity/thermal diffusivity
Momentum diffusivity/mass diffusivity
Thermal diffusivity/mass diffusivity
Thermal diffusivity/momentum diffusivity

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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

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

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