Browsing by Subject "Poiseuille flow"
Now showing items 120 of 25

Article
Asymptotic solutions of weakly compressible Newtonian Poiseuille flows with pressuredependent viscosity
(2015)We consider both the axisymmetric and planar steadystate Poiseuille flows of weakly compressible Newtonian fluids, under the assumption that both the density and the shear viscosity vary linearly with pressure. The primary ...

Conference Object
Cessation flows of bingham plastics with slip at the wall
(National Technical University of Athens, 2013)We use finite elements in space and a fully implicit scheme in time in order to solve the cessation of axisymmetric Poiseuille flow of a Bingham plastic under the assumption that slip occurs along the wall. The Papanastasiou ...

Article
Cessation of Couette and Poiseuille flows of a Bingham plastic and finite stopping times
(2005)We solve the onedimensional cessation Couette and Poiseuille flows of a Bingham plastic using the regularized constitutive equation proposed by Papanastasiou and employing finite elements in space and a fully implicit ...

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
Combined effects of compressibility and slip in flows of a HerschelBulkley fluid
(2013)In this work, the combined effects of compressibility and slip in Poiseuille flows of HerschelBulkley fluids are investigated. The density is assumed to obey a linear equation of state, and wall slip is assumed to follow ...

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
Incompressible Poiseuille flows of Newtonian liquids with a pressuredependent viscosity
(2011)The pressuredependence of the viscosity becomes important in flows where high pressures are encountered. Applications include many polymer processing applications, microfluidics, fluid film lubrication, as well as simulations ...

Article
Mechanism for extrusion instabilities in polymer melts
(1999)A mechanism for explaining some of the instabilities observed during the extrusion of polymer melts is further explored. This is based on the combination of nonmonotonic slip and elasticity, which permits the existence ...

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
Newtonian Poiseuille flows with pressuredependent wall slip
(2013)The effect of pressuredependent slip at the wall in steady, isothermal, incompressible Poiseuille flows of a Newtonian liquid is investigated. Exponential dependence of the slip coefficient on the pressure is assumed and ...

Article
Newtonian Poiseuille flows with slip and nonzero slip yield stress
(2013)The Newtonian Poiseuille flow is considered for various geometries, under the assumption that wall slip occurs above a critical value of the wall shear stress known as, the slip yield stress. In the axisymmetric and planar ...

Article
Numerical simulations of cessation flows of a Bingham plastic with the augmented Lagrangian method
(2010)The augmented Lagrangian/Uzawa method has been used to study benchmark onedimensional cessation flow problems of a Bingham fluid, such as the plane Couette flow, and the plane, round, and annular Poiseuille flows. The ...

Article
Perturbation solution of Poiseuille flow of a weakly compressible OldroydB fluid
(2011)The isothermal, planar Poiseuille flow of a weakly compressible OldroydB fluid is considered under the assumption that the density of the fluid obeys a linear equation of state. A perturbation analysis for all the primary ...

Article
Perturbation solution of the compressible annular Poiseuille flow of a viscous fluid
(2010)The isothermal annular Poiseuille flow of a weakly compressible Newtonian liquid with constant shear and bulk viscosities is considered. A linear equation of state is assumed and a perturbation analysis in terms of the ...

Article
Perturbation solutions of Poiseuille flows of weakly compressible Newtonian liquids
(2009)Both the planar and axisymmetric isothermal Poiseuille flows of weakly compressible Newtonian liquids with constant shear and bulk viscosities are solved up to the secondorder. A linear equation of state is assumed and a ...

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 ...

Article
Slip yield stress effects in startup Newtonian Poiseuille flows
(2013)Analytical solutions are derived for various startup Newtonian Poiseuille flows assuming that slip at the wall occurs when the wall shear stress exceeds a critical value, known as the slip yield stress. Two distinct regimes ...

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 ...

Article
Startup and cessation Newtonian Poiseuille and Couette flows with dynamic wall slip
(2015)Analytical solutions are derived for the startup and cessation Newtonian Poiseuille and Couette flows with wall slip obeying a dynamic slip model. This slip equation allows for a relaxation time in the development of wall ...