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- W2963569191 abstract "Interior stagnation-point flows of viscoelastic liquids arise in a wide variety of applications including extensional viscometry, polymer processing and microfluidics. Experimentally, these flows have long been known to exhibit instabilities, but the mechanisms underlying them have not previously been elucidated. We computationally demonstrate the existence of a supercritical oscillatory instability of low-Reynolds-number viscoelastic flow in a two-dimensional cross-slot geometry. The fluctuations are closely associated with the ‘birefringent strand’ of highly stretched polymer chains associated with the outflow from the stagnation point at high Weissenberg number. Additionally, we describe the mechanism of instability, which arises from the coupling of flow with extensional stresses and their steep gradients in the stagnation-point region." @default.
- W2963569191 created "2019-07-30" @default.
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- W2963569191 date "2007-11-18" @default.
- W2963569191 modified "2023-09-26" @default.
- W2963569191 title "A mechanism for oscillatory instability in viscoelastic cross-slot flow" @default.
- W2963569191 hasPublicationYear "2007" @default.
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