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impellers have been postulated as very efficient for mixing highly viscous nonNewtonian fluids (such as xanthan and mycelial broths). However, no formal characterisation has been published and no fair comparisons have been made, based on accurate power drawn measurements and using equal number of impeller stages and equal diameter, if compared (for example) with the performance of Rushton turbines. Characterisation of the shape, size, and evolution of the well-mixed zones or "caverns" were correlated with power drawn, for single and dual Rushton turbines and for one-as well as two-stage Intermig unslotted impellers. Cavern evolution studies were carried out in a mixing tank (diameter = 0.205 m, HIT = 1.6) equipped with an accurate air bearing dynamometer.

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