Abstract
Residence time distributions of gas phase have been measured in fermentation broths and in simulated media of low as well as high viscosity (1 × 10 −3 − 0.5 Pas) using a step-function-Helium-tracer technique. On the basis of these, simple mathematical models have been developed and their parameters are qualitatively correlated with operating conditions. It was shown that even in low viscosity Newtonian fluids, gas phase does not behave as well mixed. Differences between gas flow patterns in low and high viscosity fluids, already reported in literature, have been verified.
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