Abstract

Power input measurements are carried out in a production bioreactor with a liquid volume up to 25 m3. The results show that the cavity formation principle is applicable to reactors at this scale. It can also be observed that empirical correlations are not useful to predict gassed power input accurately. It is found that at gas flow rates for normal production conditions (NQ =0.1), the gassed power input is about 30–40 % of the non gassed power input.

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