Abstract
Quantitatively characterizing long-period fluctuations, which reflect the large-scale structure of a bubbly flow in a bubble column reactor, is essential to improving the reactor efficiency. First, in order to extract long-period fluctuations of bubbly flow, we proposed a newly developed method to extract the long-period fluctuations based on point-wise void fraction measurements. Analyzing the time-series point-wise void fractions measured via Four-Tip Optical-fiber Probe (F-TOP), we demonstrate that the long-period fluctuations can be extracted via wave form analysis. Second, we measured point-wise liquid-phase motion via Laser Doppler Anemometry (LDA) at the same time with the point-wise void fraction measurements. As a result, we observed that the characteristic bubble-swarm forms surrounding liquid-phase motion.
