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

Schmidt number
Sherwood number
Prandtl number
Lewis number

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Mass Transfer
Entrainer used in azeotropic distillation should

Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency
Have high latent heat of vaporisation
Form a low boiling azeotrope with one of the constituents of the mixture

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