Mass Transfer
Which of the following quantities need not be fixed before starting the design of a co-current absorber?

None of the listed here
Flow rate of entering liquid
Heat gain or loss
Flow rate of gas

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Mass Transfer
Blowdown in a cooling tower

Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Increases the scale forming tendencies of water
All of these
Is undesirable

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