In-line mixing for high reactive species using swirl flow ejector

Abstract

An in-line mixing system mainly consists of an injecting part and a mixing part. We consider that the injecting part will be more important for highly reactive species, because some reactions terminate before the mixture reaches the static mixer. This issue has limited the applications of in-line mixing. In this study, we developed an improved injecting system to resolve this issue. We used a swirl f low ejector (SFE) in which a swirl driving f low is supplied from the entire inner circumferential surface and a suction f low is injected at the center of the channel. Through CFD simulations, we revealed that the suction f low is diffused by the swirl driving f low, and mixing proceeded rapidly. In the early step of mixing, the mixing time of the new system was around four times shorter than that of the conventional system. We also performed an experiment using reactive f luids that gel upon poor mixing, and we clearly demonstrated the effectiveness of the SFE. Finally, we found that the combined use of the SFE and the static mixer is the most effective approach.