Which size of bubbles is relevant for mass transfer?(a) Small(b) Very small(c) Large(d) Very largeI got this question in a job interview.My question is taken from Oxygen Transfer in Fermenters in section Mass Transfer of Bioprocess Engineering

Which size of bubbles is relevant for mass transfer?(a) Small(b) Very

1.	Which size of bubbles is relevant for mass transfer?(a) Small(b) Very small(c) Large(d) Very largeI got this question in a job interview.My question is taken from Oxygen Transfer in Fermenters in section Mass Transfer of Bioprocess Engineering
Answer» Correct answer is (a) Small To explain I WOULD say: The most important property of air BUBBLES in fermenters is their size. Small bubbles have correspondingly slow bubble-rise velocities; consequently they stay in the liquid longer, allowing more time for the oxygen to dissolve. While it is desirable to have small bubbles, there are practical limits. Bubbles << 1 MM diameter can BECOME a nuisance in bioreactors. Oxygen concentration in these bubbles equilibrates with that in the medium within seconds, so that the gas hold-up no longer reflects the capacity of the system for mass transfer.

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