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Extrudate swell of Boger fluids

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dc.contributor.author Mitsoulis, E en
dc.date.accessioned 2014-03-01T01:33:29Z
dc.date.available 2014-03-01T01:33:29Z
dc.date.issued 2010 en
dc.identifier.issn 0377-0257 en
dc.identifier.uri http://hdl.handle.net/123456789/20443
dc.subject Boger fluids en
dc.subject Exit correction en
dc.subject Extrudate swell en
dc.subject Free surface en
dc.subject Gravity flows en
dc.subject Viscoelasticity en
dc.subject.classification Mechanics en
dc.subject.other Axisymmetric geometries en
dc.subject.other Boger fluids en
dc.subject.other Dilute polymer solutions en
dc.subject.other Excess pressure en
dc.subject.other Extrudate swell en
dc.subject.other Extrudates en
dc.subject.other Free surfaces en
dc.subject.other Free-surface gravity en
dc.subject.other Integral model en
dc.subject.other Normal stress en
dc.subject.other Numerical simulation en
dc.subject.other Shear rates en
dc.subject.other Stress difference en
dc.subject.other Stress ratio en
dc.subject.other Computer simulation en
dc.subject.other Elasticity en
dc.subject.other Shear deformation en
dc.subject.other Surfaces en
dc.subject.other Viscoelasticity en
dc.subject.other Viscosity en
dc.subject.other Fluids en
dc.title Extrudate swell of Boger fluids en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.jnnfm.2010.04.011 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.jnnfm.2010.04.011 en
heal.language English en
heal.publicationDate 2010 en
heal.abstract Boger fluids are dilute polymer solutions exhibiting high elasticity at low apparent shear rates, which leads to high extrudate swell. Numerical simulations have been undertaken for the flow of three Boger fluids (including benchmark Fluid M1), obeying an integral constitutive equation of the K-BKZ type, capable of describing the behavior of dilute polymer solutions. Their rheology is well captured by the integral model. The flow simulations are performed for planar and axisymmetric geometries without or with gravity. The results provide the extrudate swell and the excess pressure losses (exit correction), as well as the shape and extent of the free surface. All these quantities increase rapidly and monotonically with increasing elasticity level measured by the stress ratio, S-R. It was found that the main reason for the high extrudate swelling is high normal stresses exhibited in shear flow (namely, the first normal-stress difference, N-1). Surprisingly, the elongational parameter of the model or a second normal-stress difference N-2 do not affect the results appreciably. Gravity serves to lower the swelling considerably, and makes the simulations easier and in overall agreement with previous experiments. (C) 2010 Elsevier B.V. All rights reserved. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName Journal of Non-Newtonian Fluid Mechanics en
dc.identifier.doi 10.1016/j.jnnfm.2010.04.011 en
dc.identifier.isi ISI:000279193900011 en
dc.identifier.volume 165 en
dc.identifier.issue 13-14 en
dc.identifier.spage 812 en
dc.identifier.epage 824 en


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