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Characterising droplet breakup rates of shear-thinning dispersed phase in microreactors

Wong, Voon-Loong; Loizou, Katerina; Lau, Phei-Li; Graham, Richard S.; Hewkandamby, Buddhika N.

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Authors

Voon-Loong Wong

Katerina Loizou

Phei-Li Lau

RICHARD GRAHAM richard.graham@nottingham.ac.uk
Professor of Applied Mathematics

Buddhika N. Hewkandamby



Abstract

A two-phase flow predictive model with the integration of conservative level-set method (LSM) and Carreau-Yasuda constitutive equation was developed herein. The LSM was chosen as a potential interface capturing scheme for elucidating the interfacial phenomena including insight into the mechanism of shear-thinning droplets. In present paper, the dynamics of shear-dependent droplet emergence, growth, detachment and translocation in a Newtonian microsystem were examined via computational fluid dynamics (CFD) analysis. Dilute sodium carboxymethylcellulose (Na-CMC) solution was treated as dispersed phase (70 mPa.s < ηo  C*˜0.40 wt%). This striking behaviour highlights the importance of rheological effects in flows with a shear-dependent fluid under various flow conditions. The viscous effect of Na-CMC fluids substantially affects the manipulation over the droplet pinch-off time and production rate. Thus, it necessitate the control of the shear rate by adjusting the flow conditions and aspect ratio of microchannels.

Journal Article Type Article
Acceptance Date Feb 14, 2019
Online Publication Date Feb 23, 2019
Publication Date 2019-04
Deposit Date Feb 18, 2019
Publicly Available Date Feb 23, 2019
Journal Chemical Engineering Research and Design
Print ISSN 0263-8762
Electronic ISSN 1744-3563
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 144
Pages 370-385
DOI https://doi.org/10.1016/j.cherd.2019.02.024
Keywords General Chemistry; General Chemical Engineering
Public URL https://nottingham-repository.worktribe.com/output/1561872
Publisher URL https://www.sciencedirect.com/science/article/pii/S0263876219300711?via%3Dihub
Additional Information This article is maintained by: Elsevier; Article Title: Characterizing droplet breakup rates of shear-thinning dispersed phase in microreactors; Journal Title: Chemical Engineering Research and Design; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.cherd.2019.02.024; Content Type: article; Copyright: © 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

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