| Abatement of mixing in shear-free elongationally unstable viscoelastic microflows. | |
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MedLine Citation:
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PMID: 20480108 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The addition of minute amounts of chemically inert polyacrylamide polymer to liquids results in large instabilities under steady electro-osmotic pumping through 2 : 1 constrictions, demonstrating that laminar flow conditions can be broken in electro-osmotic flow of viscoelastic material. By excluding shear and imposing symmetry we create a platform where only elongational viscoelastic instabilities, and diffusion, affect mixing. In contrast to earlier studies with significant shear that found up to orders of magnitude increase in mixing we find that inclusion of polymers excites large viscoelastic instabilities yet mixing is reduced relative to polymer-free liquids. The absolute decrease in mixing we find is consistent with the understanding that adding polymer increases viscosity while viscoelastic flows progress towards elastic turbulence, a type of mild (Batchelor) turbulence, and indicates that electro-osmotic pumped devices are an ideal platform for studying viscoelastic instabilities without supplementary factors. |
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Authors:
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R M Bryce; M R Freeman |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-03-12 |
Journal Detail:
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Title: Lab on a chip Volume: 10 ISSN: 1473-0197 ISO Abbreviation: Lab Chip Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-05-18 Completed Date: 2010-07-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101128948 Medline TA: Lab Chip Country: England |
Other Details:
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Languages: eng Pagination: 1436-41 Citation Subset: IM |
Affiliation:
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Department of Physics, University of Alberta, Edmonton, T6G 2G7, Canada. rbryce@phys.ualberta.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Complex Mixtures
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chemistry* Computer Simulation Elastic Modulus Microfluidics / methods* Models, Chemical* Shear Strength Solutions / chemistry* Viscosity |
| Chemical | |
Reg. No./Substance:
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0/Complex Mixtures; 0/Solutions |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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