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Mass Transfer

Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Higbie
Toor and Marchello
Kissinevskii
Danckwerts

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Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

90-100
44119
30-40
70-80

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Mass Transfer
Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be

Humidified
Both A & B
Dehumidified
Cooled

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Mass Transfer
Lewis number (Le) is

St x Sh
Sc x Pr
Sh x Pr
Pr x St

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Mass Transfer
In case of gases, the binary diffusivity is proportional to (where, P = pressure)

1/P
√P
1/√P
P

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Mass Transfer
With increase in the concentration of the adsorbate, the integral heat of adsorption

May increase or decrease ; depends on the type of adsorbate
Increases
Decreases
Remains unchanged

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