daboratory fermenter of diameter Rushuid height of $15cm.$ The fermenter is equipped with a $5cm$ at turbulent con turbine operated at $800rpm.$ The fermentation was run therefore, the Reyno during agitation with a turbine impeller and density of the broth is close to that of water. times the diam fermenter is then scaled up so the tank and impeller are $15$ vessel is operater of the laboratory equipment. The stirrer in the large fermenter.

a$)$ What is the upper limit for the broth viscosity for the laboratory fermenter?

$[8\%]$

b$)$ How does scale$-$up affect the maximum viscosity allowable for maintenance of turbulent conditions?

$[7\%]$