Authors Pettas D., Karapetsas G., Dimakopoulos Y., Tsamopoulos J. Abstract It is well-known that by increasing the flow rate in polymer extrusion, the flow becomes unstable and the smooth extrudate surface becomes wavy and disordered to an increasing degree. In order to investigate the mechanisms responsible for these instabilities we […]
Extrudate swell
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Authors Georgiou G.C., Tsamopoulos J., Schultz W.W. Abstract We use finite elements and the full Newton iteration method to solve the steady, two-dimensional flow of a Newtonian planar film, issuing from a slit under a pressure difference between the two free surfaces, in the presence of gravity and surface tension. […]