On some nearly viscometric flows of viscoelastic liquids
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Subtitle: On some nearly viscometric flows of viscoelastic liquids
Publisher: Springer Verlag (Germany)
Publication year: 1991
Journal: Rheologica Acta (0035-4511)
Volume number: 30
Issue number: 5
Start page: 447
End page: 473
Number of pages: 27
ISSN: 0035-4511
eISSN: 1435-1528
Languages: English-United States (EN-US)
Abstract
Superposition of oscillatory shear imposed from the boundary and through pressure gradient oscillations and simple shear is investigated. The integral fluid with fading memory shows flow enhancement effects due to the nonlinear structure. Closed-form expressions for the change in the mass transport rate are given at the lowest significant order in the perturbation algorithm. The elasticity of the liquid plays as important a role in determining the enhancement as does the shear dependent viscosity. Coupling of shear thinning and elasticity may produce sharp increases in the flow rate. The interaction of oscillatory shear components may generate a steady flow, either longitudinal or orthogonal, resulting in increases in flow rates akin to resonance, and due to frequency cancellation, even in the absence of a mean gradient. An algorithm to determine the constitutive functions of the integral fluid of order three is outlined. © 1991 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG.
Keywords
Oscillating and pulsating flows flow enhancement integral fluid of order three nearly viscomeiric flow
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