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Mass Transfer

Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Durability
Porosity
Size
Cost

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Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Is independent of pressure
Varies inversely as the pressure
Is equal to the volumetric diffusivity
Varies directly as the pressure

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of Hâ‚‚/ky.Cz is around

1
0.6
0.24
0.72

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

< 6:1
< 8 : 1
> 4 :1
> 8:1

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.33
Re0.53
Re0.83
Re

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Mass Transfer
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Tray
Spray
Packed
Bubble

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