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The holdup and bubble size distribution (BSD) in bubble columns using both air/water and an industrially relevant air/fermentation media system are investigated. It was found that the BSD in the air/fermentation media system was quite narrow and did not change with height. In contrast, the BSD in the air/water system varied considerably with height depending on the sparger design used. Holdup measurements were also performed for different superficial velocities. The holdup in the air/fermentation media system was greater than that for the air/water system, a result attributed to the presence of surface‐active compounds in the fermentation media.
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McClure et al. (2013) studied this question.
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