PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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7.4 Impeller viscometer
The rheology of a Penicillium chrysogenum broth is examined using an impeller viscometer. The density of
the cell suspension is approximately 1000 kg m³. Samples of broth are stirred under laminar conditions
using a Rushton turbine of diameter 4 cm in a glass beaker of diameter 15 cm. The average shear rate
generated by the impeller is greater than the stirrer speed by a factor of about 10.2. When the stirrer shaft
is attached to a device for measuring torque and rotational speed, the following results are recorded.
Stirrer speed (s¹) Torque (Nm)
0.185
3.57 × 10-6
0.163
3.45 × 10-6
0.126
3.31 x 10-6
0.111
3.20×10-6
Can the rheology be described using a power-law model? If so, evaluate K and n.
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