Volume 42, Issue 5 pp. 1053-1058
Research Article

Enhanced Droplet Size Control in Liquid-Liquid Emulsions Obtained in a Wire-Guided X-Mixer

Thapanee Bangjang

Thapanee Bangjang

Kasetsart University, Faculty of Engineering, Department of Chemical Engineering, 50 Paholyotin Rd., 10900 Bangkok, Thailand

University of Warwick, School of Engineering, Library Road, CV4 7AL Coventry, United Kingdom

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Nikolay Cherkasov

Corresponding Author

Nikolay Cherkasov

University of Warwick, School of Engineering, Library Road, CV4 7AL Coventry, United Kingdom

Correspondence: Dr. Nikolay Cherkasov ([email protected]), Prof. Evgeny V. Rebrov ([email protected]), University of Warwick, School of Engineering, Library Road, Coventry CV4 7AL, United Kingdom.Search for more papers by this author
Petr Denissenko

Petr Denissenko

University of Warwick, School of Engineering, Library Road, CV4 7AL Coventry, United Kingdom

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Attasak Jaree

Attasak Jaree

Kasetsart University, Faculty of Engineering, Department of Chemical Engineering, 50 Paholyotin Rd., 10900 Bangkok, Thailand

Kasetsart University, Faculty of Engineering, Center for Advanced Studies in Industrial Technology, 50 Ngamwongwan Rd. Chatuchak, 10900 Bangkok, Thailand

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Evgeny V. Rebrov

Corresponding Author

Evgeny V. Rebrov

University of Warwick, School of Engineering, Library Road, CV4 7AL Coventry, United Kingdom

Tver State Technical University, Department of Biotechnology and Chemistry, Nab. A. Nikitina 22, 170026 Tver, Russia

Correspondence: Dr. Nikolay Cherkasov ([email protected]), Prof. Evgeny V. Rebrov ([email protected]), University of Warwick, School of Engineering, Library Road, Coventry CV4 7AL, United Kingdom.Search for more papers by this author
First published: 25 February 2019
Citations: 2

Abstract

The droplet size in a liquid-liquid emulsion can be controlled by placing a metal wire along the centerline of an X-mixer. Droplets gradually form when flowing along the wire, with droplet separation occurring at the tip of the wire rather than at the channel intersection in the X-mixer. The droplet size is now defined by the Plateau-Rayleigh instability developing in the axisymmetric annular flow region rather than by a sophisticated and hardly predictable three-dimensional flow at the channel intersection. The wire-guided droplet formation allows for fine control of the droplet size by changing the wire diameter, the position of the wire tip, and the flow rates. Further control of the droplet size can be achieved by adjusting the surface tension by adding a surfactant.

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