نتایج جستجو برای: viscoelastic flow

تعداد نتایج: 493096  

2003
A. Y. Gunawan J. Molenaar

In this paper, we consider an infinitely long viscoelastic thread in a tube filled with a Newtonian fluid. We apply Jeffreys model as the rheological relation for the thread. The thread moves due to a constant pressure gradient, but so slowly that the quasi-static creeping flow approximation is applicable. We investigate the effect of the ratio of viscosities, fluid elasticity, confinement and ...

2012
Dipankar Bandyopadhyay P. Dinesh Sankar Reddy Ashutosh Sharma P. Dinesh Sankar Reddy

Related Articles The final stages of capillary break-up of polymer solutions Phys. Fluids 24, 023101 (2012) Effects of particles on stability of flow-induced precursors J. Chem. Phys. 136, 054903 (2012) Kelvin-Helmholtz instability in viscoelastic fluids in presence of electro-magnetic fields Phys. Fluids 23, 094107 (2011) Electrohydrodynamic instabilities in thin liquid trilayer films Phys. Fl...

Journal: :Neurourology and urodynamics 2006
Tim Idzenga Johan J M Pel Ron van Mastrigt

AIMS We aim at developing a non-invasive method for grading and diagnosing urinary bladder outlet obstruction, based on noise recording with a perineal contact microphone during voiding. We found that the noise production during voiding depends amongst others on the viscoelastic properties of the urethral wall. To further test our method, we need a realistic biophysical model of the male urethr...

Journal: :JSME international journal 1987

2005
PENGTAO YUE JAMES J. FENG CHUN LIU J IE SHEN

This paper applies a diffuse-interface model to simulate the deformation of single drops in steady shear flows when one of the components is viscoelastic, represented by an Oldroyd-B model. In Newtonian fluids, drop deformation is dominated by the competition between interfacial tension and viscous forces due to flow. A fundamental question is how viscoelasticity in the drop or matrix phase inf...

2017
Takahiro Tsukahara Yasuo Kawaguchi

Viscoelastic liquids with very small amounts of polymer/surfactant additives can, as well known since B.A. Toms’ observation in 1948, provide substantial reductions in frictional drag of wall-bounded turbulence relative to the corresponding Newtonian fluid flow. Friction reductions of up to 80% compared to the pure water flow can be occasionally achieved with smooth channel/pipe flow of viscoel...

In this paper, we present an analytical method for solving a well-posed boundary value problem of mathematical physics governing the vibration characteristics of an internal flow propelled fluid-structure interaction where the pipeline segment is idealized as an elastic hollow beam conveying an incompressible fluid on a viscoelastic foundation. The effect of Coriolis and damping forces on the o...

2007
P. J. Oliveira

Viscoelastic flow in a square cavity is studied in detail for the FENE-CR model with a given value of extensibility. A finite volume method was employed to predict both the steady flows resulting from movement of the top cavity wall and also the recoil flows that follow the cessation of that lid-wall motion, when the fluid possesses viscoelastic properties. It is shown that this recoil flow can...

Journal: :Journal of biomechanical engineering 2011
Rashmi Raghu Irene E Vignon-Clementel C Alberto Figueroa Charles A Taylor

It is well known that blood vessels exhibit viscoelastic properties, which are modeled in the literature with different mathematical forms and experimental bases. The wide range of existing viscoelastic wall models may produce significantly different blood flow, pressure, and vessel deformation solutions in cardiovascular simulations. In this paper, we present a novel comparative study of two d...

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