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Backmixing of gas occurs in homogenous flow in bubble column.

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Backmixing of gas occurs in homogenous flow in bubble column.

(a) True

(b) False

I have been asked this question by my school teacher while I was bunking the class.

Query is from Bioreactor Configurations topic in portion Reactor Engineering of Bioprocess Engineering

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Correct option is (b) False

The explanation: Homogeneous flow occurs only at low gas flow rates and when bubbles leaving the sparger are evenly distributed across the column cross-section. In homogeneous flow, all bubbles rise with the same upward velocity and there is no backmixing of the gas phase.

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