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Annular Effect in Viscoelastic Fluids
The Physics of Fluids, 1964In the oscillating motion of an incompressible viscoelastic fluid in a pipe, at high Reynolds number the root-mean-square axial velocity has its maximum value in a boundary layer at the wall of the tube. The elasticity of the fluid can make this annular effect much more pronounced than it is in the case of a Newtonian viscous fluid.
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2013
If the stresses in a fluid depend both on strains and on strain rates, the fluid is characterized as viscoelastic. In general the stresses in a viscoelastic fluid depend on the deformation: history the fluid has been subjected to. All real fluids are really viscoelastic because the pressure p is always a function of the volumetric strain.
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If the stresses in a fluid depend both on strains and on strain rates, the fluid is characterized as viscoelastic. In general the stresses in a viscoelastic fluid depend on the deformation: history the fluid has been subjected to. All real fluids are really viscoelastic because the pressure p is always a function of the volumetric strain.
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Local linear viscoelasticity of confined fluids
The Journal of Chemical Physics, 2007In this paper the authors propose a novel method to study the local linear viscoelasticity of fluids confined between two walls. The method is based on the linear constitutive equation and provides details about the real and imaginary parts of the local complex viscosity.
Hansen, J. S. +2 more
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Capillary filling dynamics of viscoelastic fluids
Physical Review E, 2014We consider the filling of a capillary by a viscoelastic fluid described by the Phan-Thien-Tanner (PTT) constitutive behavior. By considering both vertical capillary filling and horizontal capillary filling, we demarcate the role played by gravity and fluid rheology towards long-time oscillations in the capillary penetration depth. We also consider the
Aditya, Bandopadhyay +2 more
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Viscoelastic squeeze-film flows – Maxwell fluids
Journal of Fluid Mechanics, 1983An exact solution for the squeeze-film motion in an upper convected Maxwell fluid is given for both the plane and axisymmetric cases. Inertia and viseoelastic effects are included, and it is shown that the solution depends only on the product of the Weissenberg and Reynolds numbers.
Phan-Thien, N., Tanner, R. I.
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Dynamics of Viscoelastic Fluids
2011An evolution problem in a bounded domain for viscoelastic fluids of the kind considered in Chapters 7, 9, and 12 is now presented. Our attention is confined to infinitesimal viscoelasticity for isotropic, homogeneous, and incompressible fluids.
Giovambattista Amendola +2 more
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Convection in Viscoelastic Fluids
1988Nonequilibrium systems like Rayleigh-Benard convection in external temperature gradient or Taylor instability between rotating cylinders, have been much studied, theoretically and experimentally in recent years. Of particular interest are systems like Rayleigh-Benard convection in binary mixtures [1–5], or Taylor instability in counterrotating ...
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Viscoelastic Solids and Fluids
2011We now consider special cases of the constitutive relations (6.1.15), namely linear viscoelastic solids and fluids with linear memory under isothermal conditions in the present chapter and an approximate version of rigid heat conductors in Chapter 8. Some of the formulas are similar to those derived in the general case, and detailed proofs are omitted ...
Giovambattista Amendola +2 more
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Swelling of viscoelastic matrices by viscoelastic fluids
2018A typical example of viscoelastic matrices is represented by polymeric particles devoted to the controlled release of active agents (drugs) that swell when put in contact with an external solvent, typically a physiological medium. Although, in general, physiological fluids can be considered Newtonian, this is not always the case, let us consider, for ...
G. Chiarappa +6 more
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Maxwellian Fluids; Viscoelastic Solids
1998Maxwellian fluids are viscous fluids possessing certain elastic properties which yield so-called normal stress effects (Weissenberg effects). The latter are very reminiscent of the properties of solids. On the other hand, the viscoelastic solids are elastic solids which, in addition, possess certain viscous properties. Both classes of materials have no
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