Power requirement in non‐newtonian fermentation broth

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Abstract
Power requirements in the agitation of non‐Newtonian fermentation broths with and without aeration were measured by a strain gage‐type dynamometer. Broth from the production of gluc‐amylase by Endomyces species and carboxymethyl cellulose solutions were used as non‐Newtonian fluids. In gas–liquid agitation systems, the correlation between Pg and P02 ND3/Q0.56 observed by Michel and Miller was found to be applicable to non‐Newtonian fluids in laminar and transition regions. This was particularly true for fluids with apparent viscosities larger than 300 cp. The impeller diameter and impeller blade width had considerable effects on power consumption in a nongassed system. It was suggested, therefore, that Pg/P0 should be correlated by a dimensionless term involving some impeller‐size factors.

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