Question

Dispersion of gas in stirred vessels is largely independent of sparger design?

(a) True

(b) False

I have been asked this question in an international level competition.

The origin of the question is Oxygen Transfer in Fermenters in chapter Mass Transfer of Bioprocess Engineering

Answer 1

Right choice is (a) True

The best I can explain: In a non-coalescing liquid, the bubbles remain close to the size produced at the back of the cavities. Because bubbles formed at the sparger are immediately drawn into the impeller zone, dispersion of gas in stirred vessels is largely independent of sparger design; when the sparger is located under the stirrer, it has been shown that sparger type does not significantly affect mass transfer.