Authors Fraggedakis D., Dimakopoulos Y., Tsamopoulos J. Abstract The sedimentation of a single particle in materials that exhibit simultaneously elastic, viscous and plastic behavior is examined in an effort to explain phenomena that contradict the nature of purely yield-stress materials. Such phenomena include the loss of the fore-and-aft symmetry with […]
2016
Authors Fraggedakis D., Pavlidis M., Dimakopoulos Y., Tsamopoulos J. Abstract We examine the abrupt increase in the rise velocity of an isolated bubble in a viscoelastic fluid occurring at a critical value of its volume, under creeping flow conditions. This ‘velocity discontinuity’, in most experiments involving shear-thinning fluids, has been […]
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 […]
Authors Lampropoulos N.K., Dimakopoulos Y., Tsamopoulos J. Abstract We study the transient, two-dimensional film flow over solid substrates with variable topography, a flow that has practical applications in microelectronics and microfluidics. The problem we address here is the advancing of a thin liquid film over square-shaped trenches with different depths […]
Authors Syrakos A., Dimakopoulos Y., Georgiou G.C., Tsamopoulos J. Abstract 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 cylinder filled with a […]
Authors Pavlidis M., Karapetsas G., Dimakopoulos Y., Tsamopoulos J. Abstract We examine and compare five constitutive models, which have been recently proposed to describe the behavior of elasto-visco-plastic fluids. The comparison is performed in simple rheometric flows, i.e. simple-shear, uniaxial elongation and large amplitude oscillatory tests and in the complex […]
Authors Fraggedakis D., Dimakopoulos Y., Tsamopoulos J. Abstract We examine and compare five constitutive models, which have been recently proposed to describe the behavior of elasto-visco-plastic fluids. The comparison is performed in simple rheometric flows, i.e. simple-shear, uniaxial elongation and large amplitude oscillatory tests and in the complex flow generated […]