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QUESTION 5 A fermentation conditions were optimised on a laboratory fermenter of diameter and liquid height of 1 5 c m . The fermenter is
QUESTION
A fermentation conditions were optimised on a laboratory fermenter of
diameter and liquid height of The fermenter is equipped with a
diameter Rushton turbine operated at The fermentation was run
at turbulent conditions during agitation with a turbine impeller and
therefore, the Reynolds number had to be maintained at the value of
Assuming that the density of the broth is close to that of water.
The laboratory fermenter is then scaled up so the tank and impeller are
times the diameter of the laboratory equipment. The stirrer in the large
vessel is operated at the same impeller tip speed as in the laboratory
fermenter.
a What is the upper limit for the broth viscosity for the laboratory
fermenter?
b How does scaleup affect the maximum viscosity allowable for
maintenance of turbulent conditions?
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