Results 131 to 140 of about 35,623 (166)

Lateral migration of viscoelastic droplets in a viscoelastic confined flow: role of discrete phase viscoelasticity

Soft Matter, 2019
We study wall and center migration of viscoelastic droplets in a Poiseuille flow of viscoelastic medium (PVP) at low Reynolds numbers (Re ≪ 1) and propose the existence of a new lift force whose origin lies in the viscoelasticity of the droplet phase.
Shamik Hazra, Sushanta K. Mitra, Ashis Kumar Sen   +2 more
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Theoretical simulation of transient viscoelastic flows in a viscoelastic system

Journal of Non-Newtonian Fluid Mechanics, 1985
The flow of an Oldroyd fluid exposed to a sudden arbitrary time-dependent pressure is studied in a circular tube prolonged by a viscoelastic enclosure. The momentum equations are solved using a finite difference scheme. The results presented here reveal the influence of different parameters upon the transient flow.
Randria, P., Bellet, D.
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Detecting instabilities in flows of viscoelastic fluids

International Journal for Numerical Methods in Fluids, 2003
AbstractThere is a growing interest in developing numerical tools to investigate the onset of physical instabilities observed in experiments involving viscoelastic flows, which is a difficult and challenging task as the simulations are very sensitive to numerical instabilities. Following a recent linear stability analysis carried out in order to better
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Hydrodynamic Theory for the Flow of a Viscoelastic Fluid

Journal of Applied Physics, 1957
A hydrodynamic theory for the flow of a viscoelastic fluid is formulated and applied. The viscoelasticity is specified in terms of the conventional and well-known relaxation and retardation spectra. Time dependent recoverable strains are defined with respect to convected rotating coordinate axes.
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Slow Viscoelastic Flow

1972
Constitutive equations based on the linear response functions are not adequate for most problems of viscoelastic flow. In the present chapter we first discuss the general problem of choosing a constitutive equation that can describe the stress response adequately in whatever specific problem is at hand.
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Vorticity and Hysteresis Nonlinearities in Viscoelastic Flows

International Journal of Fluid Mechanics Research, 1996
The problem of unsteady viscoelastic flow toward a moving wall is investigated. A two-dimensional plane flows of Maxwellian and Oldroyd fluids are considered. Analytical investigations have been carried out and presented for the stagnation points, for the motion of wall into the flow, for the hysteresis of a strong discontinuity and hysteresis at the ...
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On the Well-Posedness of the Incompressible Viscoelastic Flows

Bulletin of the Iranian Mathematical Society, 2018
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Stability of Viscoelastic Channel Flow

Volume 8: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A and B, 2007
The nonlinear stability and bifurcation of the one-dimensional channel (Poiseuille) flow is examined for a Johnson-Segalman fluid. The velocity and stress are represented by orthonormal functions in the transverse direction to the flow. The flow field is obtained from the conservation and constitutive equations using the Galerkin projection method ...
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Secondary stresses in viscoelastic flow

Journal of Colloid Science, 1951
Abstract Theoretical equations are developed for secondary stresses in a shearing viscoelastic fluid. The theory assumes that the elastic stresses developed by the continuous shear also relax continuously in accordance with Maxwell's relaxation theory of viscosity. The steady-state strains are analyzed by the theory of superelasticity.
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Fractional time-varying grey traffic flow model based on viscoelastic fluid and its application

Transportation Research Part B: Methodological, 2022
Mao Shuhua, Yuxiao Kang
exaly