NDLI: Flow patterns in 4:1 micro-contraction flows of viscoelastic fluids

Content Provider	Springer Nature Link
Author	Lee, Daewoong Ahn, Kyung Hyun
Copyright Year	2015
Abstract	In this paper, the flow pattern of viscoelastic fluids flowing inside a 4:1 planar contraction microchannel was investigated and quantitatively analyzed. A wide range of Weissenberg number flows of poly(ethylene oxide) solutions were observed while maintaining low Reynolds number (0.01 > Re). As the shear rate or fluid elasticity was increased, a transition from steady to unsteady flow was observed. In the steady flow region, the flow pattern was Newtonian-like, progressed to a divergent flow where the upstream flow pattern was distorted due to elasticity, and then a vortex developed at the upstream corners. The vortex, which was stable at first, fluctuated with a certain period as the Weissenberg number increased. The oscillating vortex was symmetric at first and became asymmetric with various patterns. As the elasticity increased further, the vortex randomly fluctuated without any time period. The Lyapunov exponent for the change in vortex size was positive, meaning that the flow was spatially chaotic. This paper systematically analyzed the flow patterns of the elastic fluids in the micro-contraction flow, which included; Newtonian-like flow, divergent flow, oscillating flow with symmetry, oscillating flow with asymmetry, and chaotic flow.
Starting Page	65
Ending Page	73
Page Count	9
File Format	PDF
ISSN	1226119X
Journal	Korea-Australia Rheology Journal
Volume Number	27
Issue Number	2
e-ISSN	20937660
Language	English
Publisher	Korean Society of Rheology, Australian Society of Rheology
Publisher Date	2015-05-27
Publisher Place	Seoul, Melbourne
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	viscoelastic microchannel contraction flow flow pattern Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science

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