Process Equipment and Plant Design
Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

0.0176G1.37
HG = 1.004G0.37
HG = 0.0176G0.37
1.004G0.8

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Process Equipment and Plant Design
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Reflux is not a saturated liquid
Heat of mixing of normal liquid is assumed to be zero
Molar latent heat of the two components are equal
Sensible heat changes for vapour & liquid are negligibly small

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