Bubble column research in Japan

Abstract

Many experimental studies on the bubble column have been reported by Japanese researchers since around 1960. They include studies of bubble behaviour, bubble size distribution, transition from the homogeneous bubbly flow regime to the heterogeneous liquid circulation regime, liquid velocity distribution, longitudinal liquid mixing, hydrodynamic modelling, the gas holdup, and the volumetric coefficient of gas‐liquid mass tranfer kLa. Studies covered various modified bubble columns, such as the airlift reactor with an external or internal loop, the packed bubble column, and others. Performance of three‐phase bubble columns, which deal with suspensions or emulsions, and their use as bioreactors or chemical reactors were also studied.

Lead–lithium eutectic material database for nuclear fusion technology

“…However, 2-phase dispersion models have been studied for quite a long time within the context of tritium recovery systems, i.e. bubble columns [34,35], what can be applied for TBM design. First efforts on determining the bubble diameter and behavior in helium-cooled lithium lead (HCLL) blankets have been advanced in [33].…”

Biotechnological production of itaconic acid and its biosynthesis in Aspergillus terreus

“…Therefore, various types of reactors, including the bubble column (Yoshida 1988), packed bubble column (Abraham and Sawant 1990), tubular reactor (Moser 1991), and air-lift reactor (ALR) (Siegel et al 1986), have been examined in detail. The ALR has been widely studied because it does not require mechanical agitation and therefore does not have moving parts.…”

Hydrodynamics and mass transfer in a draft tube airlift reactor with dilute alcohol solutions

“…By hindering the process of bubble coalescence and hence reducing the mean bubble size, the addition of alcohols results in the increase of gas–liquid interfacial area ( a ). On the other hand, mass transfer coefficient ( k L ) decreases in dilute alcohol solutions when compared with water, probably due to the change in the liquid flow pattern near the interface23 and its rigidity which increases the resistance to oxygen transfer 20. Besides that, the oxygen depletion of the important fraction of tiny bubbles increases the inert fraction in the gas phase reducing the solubility of the oxygen 20.…”