Coalescence is appropriate for oxygen transfer in bubbles?(a) True(b) FalseThis question was posed to me at a job interview.My question is from Oxygen Transfer in Fermenters topic in division Mass Transfer of Bioprocess Engineering

Coalescence is appropriate for oxygen transfer in bubbles?(a) True(b)

1.	Coalescence is appropriate for oxygen transfer in bubbles?(a) True(b) FalseThis question was posed to me at a job interview.My question is from Oxygen Transfer in Fermenters topic in division Mass Transfer of Bioprocess Engineering
Answer» CORRECT option is (b) False The best explanation: Coalescence of small bubbles into bigger bubbles is generally undesirable because it reduces the total interfacial area and gas hold-up. Frequency of coalescence depends mainly on the liquid properties. In a COALESCING liquid, a large fraction of bubble collisions results in the formation of bigger bubbles, while in non-coalescing liquids colliding bubbles do not COALESCE readily. Salts ACT to suppress coalescence; therefore, fermentation media are usually non-coalescing to some extent depending on com- position. This is an advantage for oxygen mass TRANSFER.

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