Results 161 to 170 of about 35,308 (208)
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Sink Flows of Viscoelastic Fluids
Journal of Rheology, 1986Both two-constant and three-parameter upper convected Maxwell-Oldroyd models of viscoelastic fluids are used in this analysis of spherical and cylindrical sink flows. For spherical sink flows the stresses rise rapidly initially and the stress levels attained are large but bounded, while for cylindrical sink flows the viscoelastic stresses are modest ...
Chakraborty, A. K., Metzner, A. B.
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SWIRLING FLOWS OF VISCOELASTIC FLUIDS
Computers & Structures, 1988Few problems in Newtonian fluid mechanics can match the attention which has been given to the study of the flow of a Newtonian fluid between two parallel plates rotating about a common axis. Most of these analyses are based on the similarity transformation of Kármán to study axisymmetric solutions. Recently, \textit{S. V.
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On the oldroid model of a viscoelastic fluid
Functional Analysis and Its Applications, 1999The author studies the following initial-boundary value problem: \(v_t(t, x)+ D(v)- \gamma_1\Delta v(t,x)- \gamma_2\Delta \int^t_0\exp(\alpha(s- t)) v(s, x) ds+ \nabla p(t,x)= f(t,x)\), \(\text{div }v(t, x)= 0\), \((t,x)\in Q\), \(\int_\Omega p(t,x) dx= 0\), \(t\geq 0\), \(v(0,x)= v_0(x)\), \(x\in\Omega\), \(v(t,x)= 0\), \(t\geq 0\), \(x\in\partial ...
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Issues In Viscoelastic Fluid Mechanics
Annual Review of Fluid Mechanics, 1990nt transient that may be many orders of magnitude longer than time scales associated with instrument inertia. Intrinsic material time scales can be identified with the dynamics of the macro molecular chains. Shaping processes for polymeric materials are usually carried out in the liquid state, often over times that are rapid relative to those ...
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The Propagation of Vorticity in a Viscoelastic Fluid
Journal of Non-Newtonian Fluid Mechanics, 1985A layer of constant vorticity exists in an infinite space of incompressible isotropic viscoelastic fluid for which the shear stress for rectilinear shearing flows depends linearly on the history of the velocity gradient. At some instant of time the forces maintaining this flow are removed.
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Observability of viscoelastic fluids
Journal of Non-Newtonian Fluid Mechanics, 2010zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhou, Hong +3 more
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Viscoelastic relaxation in fluids
Bulletin of the Russian Academy of Sciences: Physics, 2015The shear elasticity of different fluids are studied experimentally at relatively low frequencies of 40 and 74 kHz. The real and imaginary shear moduli of several liquids are measured using the acoustic resonance method. A low-frequency viscoelastic relaxation process is assumed to occur in a fluid with a period of relaxation much longer than the ...
B. B. Badmaev +2 more
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Rayleigh–Benard convection of viscoelastic fluid
Applied Mathematics and Computation, 2003zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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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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Polymer Engineering & Science, 1978
Abstract Shear stress and first normal stress difference data are presented for materials which exhibit a constant viscosity and yet at the same time exhibit elasticity levels of the same order as polymer melts. Flow pattern observations in circular die entry flows in conjunction with independent shear and normal stress measurement ...
David V. Boger, Hang Nguyen
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Abstract Shear stress and first normal stress difference data are presented for materials which exhibit a constant viscosity and yet at the same time exhibit elasticity levels of the same order as polymer melts. Flow pattern observations in circular die entry flows in conjunction with independent shear and normal stress measurement ...
David V. Boger, Hang Nguyen
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