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1 PublicationOn Inter-bubble Distances and Bubble Clustering in Bubbly Flows: An Experimental Study
Kipping, R.; Wagner, M.; Hampel, U.
Swarm effects in bubble columns result from the interaction of the bubbles at higher gas holdup. The flow around individual bubbles in a swarm influences the movement of the following bubbles and this has a feedback on the flow regime on a larger scale. That is, hydrodynamics that can no longer be described with models for single rising bubbles. The experimental investigation of the multiscale hydrodynamics in three-dimensional bubble columns was so far limited by the available measurement techniques. In this study, ultrafast X-ray tomography (UFXCT) was applied on bubbly flows in a lab scale bubble column to determine inter-bubble distances and clustering characteristics for different gas holdups and bubble diameters. Applying the pair correlation function reveals a pronounced vertical clustering for large bubbles with Eo ≥ 3.82, whereas no clustering has been observed for bubbles of lower Eo. It was found that clustering orientation mainly depends on deformability of the bubbles but not on gas holdup.
Keywords: bubbly flows; ultrafast X-ray tomography; inter-bubble distances; pair correlation function; bubble clustering
Involved research facilities
- TOPFLOW Facility
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Data for: On Inter-bubble Distances and Bubble Clustering in Bubbly Flows: An …
ROBIS: 33036 HZDR-primary research data are used by this (Id 33024) publication
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Chemical Engineering Journal 431(2022)4, 133486
Online First (2021) DOI: 10.1016/j.cej.2021.133486
Cited 8 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-33024