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
> 8:1
> 4 :1

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Mass Transfer
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

1000
2000
1500
2500

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Mass Transfer
In case of a desorber (stripper), the

Temperature remains unaffected
Operating line always lies above the equilibrium curve
Temperature always increases
Operating line always lies below the equilibrium curve

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