Journal
CHEMICAL ENGINEERING SCIENCE
Volume 207, Issue -, Pages 1331-1340Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2019.07.046
Keywords
Taylor flow; Milli channels; Mass transfer; Taylor vortex; T-mixer
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Funding
- Russian Foundation for Basic Research [N2 18-03-00206-a]
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The results of the recent experimental work performed by Butler et al. (2016, 2018) are analysed based on the dominant phenomena: (i) small scale convection by means of Taylor vortices in the liquid slugs and (ii) diffusion in lubrication film. A main result shown here is that the Taylor circulation frequency is able to reflect the global mass transfer rate in gas-liquid Taylor flow through an almost linear relationship, which emphasizes the interest of the circulating motion in the slug, and gives a very simple correlation to predict the k(L)a value (at large Schmidt number). A mechanism of flow behavior during the bubble formation at the T-mixer is proposed as a possible explanation of unexpected concentration areas (called islands). However, despite of these unusual concentration field structures in these cases, the mass transfer rate coefficient k(L)a is still accurately predicted by the Taylor circulation frequency in the slug. (C) 2019 Elsevier Ltd. All rights reserved.
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