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The smaller bubbles are sensitive than larger bubbles?(a) True(b) FalseI had been asked this question during an interview for a job.This intriguing question comes from Oxygen Transfer in Fermenters topic in portion Mass Transfer of Bioprocess Engineering

Answer»

The CORRECT choice is (a) True

For explanation: kL in FERMENTATION LIQUIDS is about 3-4×10^-4 m s^-1 for bubbles greater than 2-3 mm DIAMETER; this can be reduced to 1×10^-4m s^-1 for smaller bubbles depending on bubble rigidity. Once the bubbles are above 2-3 mm in size, kL is relatively constant and insensitive to conditions.



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