Blasensaulen werden charakterisiert durch den relativen Gasgehalt E,, die Geschwindigkeiten der Phasen, den Sauterschen Blasendurchmesser d,, die spezifische Blasenoberflache a und die volumenbezogene Stoffubergangszahl k,a. Diesgilt auch fur Blasensaulen rnit hochviskosen Medien. In den bisherigen Arbeiten wurde stillschweigend angenommen, daB die Blasen mit unterschiedlicher GroBe im Blasenschwarm sich ahnlich verhalten, so daB man bei der Berechnung der spezifischen Gas/Fliissigkeits-Austauschflache a fur den Stofftransport den relativen Gasgehalt verwendet, der nach GI. (2)
During the cultivation of E. coli in an airlift tower-loop bioreactor, the following properties were measured: transverse profiles of Sauter bubble diameter, d(S); local relative gas holdup, E(G); bubble rise velocity, u(BS); local mean velocity, ū turbulence intensity, u'; macrotime scale, T(EL); dissipation time scale, tau(E); power spectrum, E(n); and energy dissipation spectrum D(n) at different distances from the aerator. The influence, distance from the aerator, absence and/or presnece of cells, and batch and/or continuous-culture operation on the behavior of the two-phase system are discussed on the basis of these properties.
The following two-phase properties were evaluated in bubble column reactors with porous plate (5 #m pore diameter) or perforated plate (1 mm and/or 3 mm hole diameter) gas distributors using distilled water or a 1% methanol solution: transverse profiles of the mean and Sauter bubble diameters, local gas holdups, true mean liquid and bubble velocities. Furthermore, swarm bubble velocity distributions were evaluted and compared with calculated values.
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