Minimum mixing time during agitation with turbine impeller

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Reference no: EM133932336

Question

To ensure turbulent conditions and minimum mixing time during agitation with a turbine impeller, the Reynolds number should be at least 104.

1. A stirred laboratory-scale vessel with a turbine impeller 5 cm in diameter is operated at 800 rpm. If the density of the broth being stirred is similar to that of water, then what is the upper limit for the viscosity of the suspension if adequate mixing is to be maintained?

2. The mixing system is scaled up so that the diameter of the tank and its impeller is 15 times larger than the lab-scale system. The stirrer in the large vessel is operated so that the stirrer tip speed (=pND) is the same as in the laboratory system. How does the scale-up under these conditions affect the maximum allowable viscosity?

Reference no: EM133932336

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