Authors Tsouka S., Dimakopoulos Y., Tsamopoulos J. Abstract We consider the two dimensional, steady flow of a dilute polymer solution over a solid substrate with periodic topography under the action of a body force. We examine how the distribution of polymer is affected by flow conditions, physical properties and substrate […]
Viscoelasticity
6 posts
Authors Pavlidis M., Dimakopoulos Y., Tsamopoulos J. Abstract Two-dimensional, steady flow of a viscoelastic film over a periodic topography under the action of a body force is studied. The exponential Phan-Thien and Tanner (ePTT) constitutive model is used. The conservation equations are solved via the usual mixed finite element method […]
Authors Pavlidis M., Dimakopoulos Y., Tsamopoulos J. Abstract The one-dimensional, gravity-driven film flow of a linear (l) or exponential (e) Phan-Thien and Tanner (PTT) liquid, flowing either on the outer or on the inner surface of a vertical cylinder or over a planar wall, is analyzed. Numerical solution of the […]
Authors Karapetsas G., Tsamopoulos J. Abstract The steady extrusion of viscoelastic materials from a straight, annular die is studied theoretically. The viscoelastic behavior is modelled using the affine Phan-Thien and Tanner (PTT) constitutive equation of the exponential form. For the numerical solution of the governing equations the mixed finite element […]
Authors Dimakopoulos Y., Tsamopoulos J. Abstract We examine the transient displacement of viscoelastic fluids by a gas in straight cylindrical tubes of finite length. For the simulation of the processes, the mixed finite element method is combined with a quasi-elliptic grid generation scheme for discretizing the highly deforming domain of […]
Authors Foteinopoulou K., Mavrantzas V.G., Tsamopoulos J. Abstract Numerical results are presented concerning bubble growth in Newtonian and viscoelastic filaments undergoing stretching. In practice, such bubbles or cavities develop in materials (either in their bulk or at their interface with a substrate) such as the pressure sensitive adhesives. The problem […]