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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ √D
K ∝ D1.5
K ∝ D
K ∝ D2

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Mass Transfer
The adiabatic saturation curve for a vapour-gas mixture is

Slightly concave upward
Straight line
None of these
Slightly concave downward

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Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

T⁴
T²
T
√T

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Mass Transfer
In a packed bed absorption column, the channelling will be noted by the

Sharp drop in pressure drop
Increase in flow rate
Sharp rise in pressure drop
None of these

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Mass Transfer
Minimum reflux ratio in a distillation column results in

Minimum reboiler size
Maximum condenser size
Optimum number of trays
Minimum number of trays

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Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Wetted wall tower
Perforated tray tower
Grid tray tower
Bubble cap tower

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