Mass Transfer
Batch tray dryers suffers from the disadvantage of

All of the listed here
High labour cost & low heat economy
High maintenance cost
Non-uniform & low production rate

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Total cost first decreases and then increases
Number of plates decreases very slowly first and then more and more rapidly
Liquid flow increases while the vapor flow decreases for a system
Slope of the operating line in stripping section decreases

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Mass Transfer
The McCabe Δ L law states that the

Linear crystal growth rate does not depend on the crystal size
Linear crystal growth rate depends on the degree of supersaturation
Linear crystal growth rate depends on the crystal size
Molar heats of vaporisation of components are nearly equal

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