Deformation of a viscoelastic droplet passing through a microfluidic contraction

Harvie, D. J. E., Cooper-White, J. J. and Davidson, M. R. (2008) Deformation of a viscoelastic droplet passing through a microfluidic contraction. Journal of Non-Newtonian Fluid Mechanics, 155 1-2: 67-79. doi:10.1016/j.jnnfm.2008.05.002


Author Harvie, D. J. E.
Cooper-White, J. J.
Davidson, M. R.
Title Deformation of a viscoelastic droplet passing through a microfluidic contraction
Journal name Journal of Non-Newtonian Fluid Mechanics   Check publisher's open access policy
ISSN 0377-0257
Publication date 2008-11-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.jnnfm.2008.05.002
Open Access Status
Volume 155
Issue 1-2
Start page 67
End page 79
Total pages 13
Editor G. H. McKinley
R. Keunings
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Subject C1
091501 Computational Fluid Dynamics
091504 Fluidisation and Fluid Mechanics
970109 Expanding Knowledge in Engineering
Abstract A computational fluid dynamics algorithm that uses a volume of fluid method to model immiscible phase behaviour is adapted to simulate the flow of viscoelastic fluids. Two-dimensional Cartesian simulations of a viscoelastic droplet passing through a contraction are compared against experimental results generated using a three-dimensional planar contraction. Viscoelastic effects are simulated using the Oldroyd-B rheological model. The physical and numerical models capture the deformation process well, particularly the characteristic forked tail that develops on the viscoelastic droplet while it is within the contraction. Encapsulation of continuous phase fluid is observed in the experiments, but not predicted by the simulations. We suggest this is due to inadequate mesh refinement at the length scale of a fine thread entrainment process. The numerical results show the existence of an elastic stress within the droplet that could cause the entrainment and subsequent encapsulation. The process has application potential in the manufacture of micron-sized drug and chemical delivery capsules.
Keyword Viscoelastic
Volume of fluid
Contraction
Microfluidics
Non-Newtonian
Droplet
Oldroyd-B
Drug delivery
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 14 Apr 2009, 19:35:11 EST by Mrs Jennifer Brown on behalf of Aust Institute for Bioengineering & Nanotechnology