On some nearly viscometric flows of viscoelastic liquids

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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.
Original languageEnglish
Pages (from-to)447-473
Number of pages27
JournalRheologica Acta
Volume30
Issue number5
DOIs
Publication statusPublished - 1991

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Flow of fluids
Elasticity
Flow rate
shear
Fluids
Shear thinning
Steady flow
liquids
Pressure gradient
Mass transfer
elastic properties
flow velocity
Viscosity
Data storage equipment
shear thinning
augmentation
fluids
steady flow
Liquids
fading

Cite this

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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. {\circledC} 1991 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG.",
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On some nearly viscometric flows of viscoelastic liquids. / Siginer, A.

In: Rheologica Acta, Vol. 30, No. 5, 1991, p. 447-473.

Research output: Contribution to journalArticle

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PY - 1991

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AB - 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.

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