Bubble column bioreactors |
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Authors: | R. Buchholz K. Schügerl |
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Affiliation: | (1) Institut für Technische Chemie der Universität Hannover, Callinstraße 3, D-3000 Hannover 1, Germany |
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Abstract: | Summary The photographic and electrical conductivity methods to measure the structure of two phase flow, especially bubble size, bubble frequency, local gas hold-up and, for the latter, the bubble velocity are described.Symbols specific interfacial area - a gas/liquid interfacial area - B constant in Eq. (4) - d diameter of the bubbles - d mean diameter of the bubbles - dS Sauter diameter - EG relative gas hold up - I current - kL mass transfer coefficient across the gas/liquid interface - kL local kL - LT–1 - LT–1 - 1 longitudinal distance between the start and stop sensors - 1B pierced length of the bubble - t time - t1 length of the square-wave signal at the start sensor - t2 length of the square-wave signal at the stop sensor - t12 time delay between start and stop signals - V volume of the bubbling layer - VL volume of the bubble free layer - VB bubble volume - vB bubble velocity |
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