Browsing by Author "Kaoullas, G."
Now showing items 1-8 of 8
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Conference Object
Cessation flows of bingham plastics with slip at the wall
Damianou, Y.; Philippou, Maria; Kaoullas, G.; Georgiou, Georgios C. (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 ...
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Cessation of viscoplastic Poiseuille flow in a square duct with wall slip
Damianou, Y.; Kaoullas, G.; Georgiou, Georgios C. (2015)We solve numerically the cessation of the pressure-driven Poiseuille flow of a Bingham plastic under the assumption that slip occurs along the wall following a generalized Navier-slip law involving a non-zero slip yield ...
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Article
Cessation of viscoplastic Poiseuille flow with wall slip
Damianou, Y.; Philippou, Maria; Kaoullas, G.; Georgiou, Georgios C. (2014)We solve numerically the cessation of axisymmetric Poiseuille flow of a Herschel-Bulkley fluid under the assumption that slip occurs along the wall. The Papanastasiou regularization of the constitutive equation is employed. ...
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Newtonian flow in a triangular duct with slip at the wall
Georgiou, Georgios C.; Kaoullas, G. (2013)We consider the Newtonian Poiseuille flow in a tube whose cross-section 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. ...
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Newtonian Poiseuille flows with slip and non-zero slip yield stress
Kaoullas, G.; Georgiou, Georgios C. (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 ...
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Slip yield stress effects in start-up Newtonian Poiseuille flows
Kaoullas, G.; Georgiou, Georgios C. (2013)Analytical solutions are derived for various start-up 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 ...
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Start-up and cessation Newtonian Poiseuille and Couette flows with dynamic wall slip
Kaoullas, G.; Georgiou, Georgios C. (2015)Analytical solutions are derived for the start-up 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 ...
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Conference Object
Stopping times in cessation flows of Bingham plastics with slip at the wall
Philippou, Maria; Damianou, Y.; Kaoullas, G.; Georgiou, Georgios C. (2012)We solve numerically the cessation of axisymmetric Poiseuille flow of a Bingham plastic assuming that slip occurs along the wall. A power-law expression is used to relate the wall shear stress to the slip velocity. The ...