caa a22 4500 60546667X CHVBK 20210128100308.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00397-015-0844-0 doi (NATIONALLICENCE)springer-10.1007/s00397-015-0844-0 Kwon Youngdon School of Chemical Engineering, Sungkyunkwan University, 440-746, Suwon, Gyeonggi-do, Korea aut Melt fracture modeled as 2D elastic flow instability [Elektronische Daten] [Youngdon Kwon] Employing a finite element computing scheme implemented onto the Leonov viscoelastic model, we newly describe various kinds of melt fracture for the extrudate exiting from the Poiseuille flow in the contraction channel with wall slip ignored. Four types such as sharkskin, gross melt fracture, slow surface undulation, and ripples are found depending on the flow conditions like the flow rate and liquid property, and they are expressed as 2D elastic instability in this inertialess flow regime. Even though not considered, the effect of die wall slip has to be included in the realistic modeling of melt fracture. However, here, we make the first attempt to analyzing extrudate instability in terms of purely fluid mechanical factors. As a result, each type of melt fracture is verified to result from the different origin, and thus, geometric singularities and streamline vortices at contraction corner and die exit determine this type of extrudate distortion. Springer-Verlag Berlin Heidelberg, 2015 Melt fracture nationallicence Sharkskin nationallicence Numerical simulations nationallicence Leonov model nationallicence Elastic instability nationallicence Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 445-453 0035-4511 54:5<445 2015 54 397 https://doi.org/10.1007/s00397-015-0844-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0844-0 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Kwon Youngdon School of Chemical Engineering, Sungkyunkwan University, 440-746, Suwon, Gyeonggi-do, Korea aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 445-453 0035-4511 54:5<445 2015 54 397