Three-dimensional viscoelastic instabilities in microchannels

Poole, RJ ORCID: 0000-0001-6686-4301 (2019) Three-dimensional viscoelastic instabilities in microchannels. JOURNAL OF FLUID MECHANICS, 870. pp. 1-4.

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Official URL: http://dx.doi.org/10.1017/jfm.2019.260

Abstract

<jats:p>Whereas the flow of simple single-phase Newtonian fluids tends to become more complex as the characteristic length scale in the problem (and hence the Reynolds number) increases, for complex elastic fluids such as dilute polymer solutions the opposite holds true. Thus small-scale, so-called ‘microfluidic’ flows of complex fluids can exhibit rich dynamics in situations where the ‘equivalent’ flow of Newtonian fluids remains linear and predictable. In the recent study of Qin <jats:italic>et al.</jats:italic> (<jats:italic>J. Fluid Mech.</jats:italic>, vol. 864, 2019, R2) of the flow of a dilute polymeric fluid past a <jats:inline-formula><jats:alternatives><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="gif" xlink:type="simple" xlink:href="S002211201900260X_inline1" /><jats:tex-math>$50~\unicode[STIX]{x03BC}\text{m}$</jats:tex-math></jats:alternatives></jats:inline-formula> cylinder (in a <jats:inline-formula><jats:alternatives><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="gif" xlink:type="simple" xlink:href="S002211201900260X_inline2" /><jats:tex-math>$100\times 60~\unicode[STIX]{x03BC}\text{m}$</jats:tex-math></jats:alternatives></jats:inline-formula> channel), a novel 3-D holographic particle velocimetry technique reveals the underlying complexity of the flow, including inherent three-dimensionality and symmetry breaking as well as strong upstream propagation effects via elastic waves.</jats:p>

Item Type:	Article
Uncontrolled Keywords:	polymers, viscoelasticity
Depositing User:	Symplectic Admin
Date Deposited:	20 May 2019 11:41
Last Modified:	19 Jan 2023 00:44
DOI:	10.1017/jfm.2019.260
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3042148