Browsing by Subject "Slip"
Now showing items 120 of 21

Article
Cessation of Newtonian circular and plane Couette flows with wall slip and nonzero slip yield stress
(2017)We solve analytically the cessation flows of a Newtonian fluid in circular and plane Couette geometries assuming that wall slip occurs provided that the wall shear stress exceeds a critical threshold, the slip yield stress. ...

Article
Cessation of viscoplastic Poiseuille flow in a square duct with wall slip
(2015)We solve numerically the cessation of the pressuredriven Poiseuille flow of a Bingham plastic under the assumption that slip occurs along the wall following a generalized Navierslip law involving a nonzero slip yield ...

Article
Cessation of viscoplastic Poiseuille flow with wall slip
(2014)We solve numerically the cessation of axisymmetric Poiseuille flow of a HerschelBulkley fluid under the assumption that slip occurs along the wall. The Papanastasiou regularization of the constitutive equation is employed. ...

Article
Development lengths in Newtonian Poiseuille flows with wall slip
(2016)The effect of wall slip on the development of planar and axisymmetric Newtonian Poiseuille flows is studied by means of finite element simulations. The Navier slip law is employed. i.e., it is assumed that the slip velocity ...

Article
Extrusion of a compressible Newtonian fluid with periodic inflow and slip at the wall
(1996)We explore a mechanism of extrusion instability, based on the combination of nonlinear slip and compressibility. We consider the timedependent compressible Newtonian extrudate swell problem with slip at the wall. Steadystate ...

Article
Linear stability diagrams for the shear flow of an OldroydB fluid with slip along the fixed wall
(1998)We consider the timedependent shear flow of an OldroydB fluid with slip along the fixed wall. Slip is allowed by means of a generic slip equation predicting that the shear stress is a nonmonotonic function of the velocity ...

Article
Newtonian flow in a triangular duct with slip at the wall
(2013)We consider the Newtonian Poiseuille flow in a tube whose crosssection is an equilateral triangle. It is assumed that boundary slip occurs only above a critical value of the wall shear stress, namely the slip yield stress. ...

Article
Numerical simulation of the extrusion of strongly compressible Newtonian liquids
(2008)The axisymmetric and plane extrusion flows of a liquid foam are simulated assuming that the foam is a homogeneous compressible Newtonian fluid that slips along the walls. Compressibility effects are investigated using both ...

Article
On numerical simulations of polymer extrusion instabilities
(2002)The objective of this study is mainly to review recent work concerning the numerical modeling of the stickslip and gross melt fracture polymer extrusion instabilities. Three different mechanisms of instability are discussed: ...

Article
On the combined effects of slip, compressibility, and inertia on the Newtonian extrudateswell flow problem
(2013)We solve both the planar and axisymmetric extrudateswell flows of a compressible Newtonian liquid with Navier slip at the wall, using the finiteelement method in space and a fullyimplicit finitedifference scheme in ...

Article
On the stability of the shear flow of a viscoelastic fluid with slip along the fixed wall
(1996)In this paper we solve the timedependent shear flow of an OldroydB fluid with slip along the fixed wall. We use a nonlinear slip model relating the shear stress to the velocity at the wall and exhibiting a maximum and ...

Article
Perturbation solutions of weakly compressible Newtonian Poiseuille flows with Navier slip at the wall
(2012)We consider both the planar and axisymmetric steady, laminar Poiseuille flows of a weakly compressible Newtonian fluid assuming that slip occurs along the wall following Navier's slip equation and that the density obeys a ...

Conference Object
Stability of the annular Poiseuille flow of a Newtonian liquid with slip along the walls
(2008)The annular Poiseuille flow of a compressible Newtonian fluid is studied assuming that slip occurs along the wall. Different slip models relating the wall shear stress to the slip velocity are employed. In the case of ...

Article
Stability of the annular Poiseuille flow of a Newtonian liquid with slip along the walls
(2009)The annular Poiseuille flow a Newtonian fluid is studied assuming that slip occurs along the walls. Different slip models relating the wall shear stress to the slip velocity are employed. In the case of nonmonotonic slip ...

Conference Object
Stopping times in cessation flows of Bingham plastics with slip at the wall
(2012)We solve numerically the cessation of axisymmetric Poiseuille flow of a Bingham plastic assuming that slip occurs along the wall. A powerlaw expression is used to relate the wall shear stress to the slip velocity. The ...

Article
Timedependent compressible extrudateswell problem with slip at the wall
(1994)We solve the timedependent compressible Newtonian extrudateswell problem with slip at the wall, in an attempt to simulate the stickslip extrusion instability. An arbitrary nonlinear slip model relating the shear stress ...

Article
The timeindependent, compressible Poiseuille and extrudateswell flows of a Carreau fluid with slip at the wall
(2003)We solve the timedependent, compressible Poiseuille and extrudateswell flows of a shearthinning fluid that obeys the Carreau constitutive model, using finite elements in space and a fullyimplicit scheme in time. Slip ...

Article
A twodimensional numerical study of the stickslip extrusion instability
(2007)The timedependent, compressible extrusion of a Carreau fluid is solved over the reservoirdieextrudate region using finite elements in space and a fully implicit scheme in time. A nonmonotonic slip law based on experimental ...

Article
A twodimensional numerical study of the stickslip extrusion instability
(2007)The timedependent, compressible extrusion of a Carreau fluid is solved over the reservoirdieextrudate region using finite elements in space and a fully implicit scheme in time. A nonmonotonic slip law based on experimental ...

Article
Viscoplastic flow in an extrusion damper
(2016)Numerical simulations of the flow in an extrusion damper are performed using a finite volume method. The damper is assumed to consist of a shaft, with or without a spherical bulge, oscillating axially in a containing ...