Abstract
Bubbly flows are applied in many industrial applications. For the purpose of improving industrial bubble column reactors, a deep understanding of the large-scale structure of the flows is required. We have experimentally approached it by using a large-diameter vessel (380mm in diameter and 1500mm in height), Four-Tip Optical-fiber Probe and LDA. We carried out simultaneous measurements of point-wise void fractions and liquid-phase velocities at the same point. We quantitatively extracted the long-period fluctuations of both phases and characterized the flows in the large vessel. Furthermore, we measured spatial correlations to estimate integral scale. We quantitatively obtained a close relationship between the fluctuations in both phases.
