Preparation of microdispersed droplets by phase inversion in gas/liquid/liquid microdispersion system

[Display omitted] •Gas/liquid/liquid systems with phase inversion were designed for preparing emulsion.•Five typical flow regimes were observed, including one for preparing O/W emulsion.•Effects of parameters on flow regime transition and oil droplet size were studied.•Mathematical models were estab...

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Bibliographic Details
Published in:Chemical engineering science 2020-05, Vol.217, p.115498, Article 115498
Main Authors: Ji, Ya-Ni, Geng, Wen-Jie, Ma, Chun-Yang, Tan, Jing, Deng, Wen-Sheng, Liu, Bin, Su, Yue-Feng
Format: Article
Language:English
Subjects:
Emulsion preparation
Flow regime transition
Gas/liquid/liquid system
Microdisperion
Modeling and correlation
Phase inversion
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Summary:[Display omitted] •Gas/liquid/liquid systems with phase inversion were designed for preparing emulsion.•Five typical flow regimes were observed, including one for preparing O/W emulsion.•Effects of parameters on flow regime transition and oil droplet size were studied.•Mathematical models were established for correlating averaged droplet size.•The most effective gas/liquid/liquid mode was recommended for reducing droplet size. A simple and effective method was conducted for preparing microdispersed droplets with decreased size and increased uniformity, in which phase inversion in high-phase-ratio liquid/liquid system was combined with addition of microbubbles. Five typical flow patterns were observed, including W/O, O/W/O, transition regime, O/W and G/W/O regimes. Flow regime transition was observed, according to which physical properties of systems and operating conditions for preparing single-oil-droplet-in-water emulsion were determined in different liquid/liquid and gas/liquid/liquid modes. Effects of liquid viscosities as well as interfacial tension on droplet size (DO) and its standard deviation (SD) were studied systematically and the most effective gas/liquid/liquid mode was recommended. Mathematical models were established for correlating DO in five different modes, which show relatively good agreement with experimental results. DO decreases by 42% via introducing phase inversion and further reduces to 25% by addition of microbubbles, both under the same operating conditions.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2020.115498