0
research-article

Droplet formation and fission in shear-thinning/Newtonian multiphase system using bilayer bifurcated microchannel

[+] Author and Article Information
Yong Ren

ASME Member Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham Ningbo China; Research Centre for Fluids and Thermal Engineering, University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo 315100 China
yong.ren@nottingham.edu.cn

Kai Seng Koh

School of Engineering and Physical Sciences, Heriot-Watt University Malaysia, No.1 Jalan Venna P5/2, Precinct 5 62200 Putrajaya Malaysia
k.koh@hw.ac.uk

Jit Kai Chin

Department of Chemical and Environmental Engineering, University of Nottingham Malaysia Campus, 1816, West Street, Jinjang North, 52000 Kuala Lumpur, Malaysia
jit-kai.chin@nottingham.edu.my

Jing Wang

Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo 315100 China
jing.wang@nottingham.edu.cn

Conghua Wen

School of Mathematical Sciences, University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo 315100 China
alan.wen@nottingham.edu.cn

Yuying Yan

Research Centre for Fluids and Thermal Engineering, University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo 315100 China, Research Group of Fluids and Thermal Engineering, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK
yuying.yan@nottingham.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4037338 History: Received May 26, 2016; Revised March 23, 2017

Abstract

With a novel platform of bilayer polydimethylsiloxane (PDMS) microchannel formed by bifurcated junction, we aim to investigate droplet formation and fission in a multiphase system with complex 3D structure; and understand the variations in mechanism associated with droplet formation and fission in the microstructure between shear-thinning/Newtonian system versus Newtonian/Newtonian system. The investigation concentrates on shear-thinning fluid because it is one of the most ubiquitous rheological properties of non-Newtonian fluids. Sodium carboxymethyl cellulose (CMC) solution and silicon oil have been used as model fluids and numerical model has been established to characterize the shear-thinning effect to formation of CMC-in-oil emulsions, as well as breakup dynamics when droplets flow through 3D bifurcated junction. The droplet volume and generation rate have been compared between two systems at the same Weber number and Capillary number. Variation in droplet fission has been found between two systems, demonstrating that the shear-thinning property and confining geometric boundaries significantly affect the deformation and breakup of each mother droplet into two daughter droplets at bifurcated junction. The understanding of the droplet fission in the novel microstructure will enable more versatile control over the emulsion formation and fission when non-Newtonian fluids are involved. The model systems in the study can be further developed to investigate the mechanical property of emulsion templated particles such as drug encapsulated microcapsules when they flow through complex media structures, such as blood capillaries or the porous tissue structure, which feature with bifurcated junction.

Copyright (c) 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In