Mass Transfer
Which of the following plays an important role in problems of simultaneous heat and mass transfer?

Prandtl number
Lewis number
Schmidt number
Sherwood number

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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
Viscosity variation of the fluids may cause channeling/flooding
None of these

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