Numerical simulation of entry flow of fluid S1

Mitsoulis, E

dc.contributor.author	Mitsoulis, E	en
dc.date.accessioned	2014-03-01T01:47:40Z
dc.date.available	2014-03-01T01:47:40Z
dc.date.issued	1998	en
dc.identifier.issn	0377-0257	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25284
dc.subject	entry flow	en
dc.subject	4 : 1 contraction	en
dc.subject	polymer solutions	en
dc.subject	vortex growth	en
dc.subject	viscoelasticity	en
dc.subject	integral constitutive equations	en
dc.subject.classification	Mechanics	en
dc.subject.other	INTEGRAL CONSTITUTIVE EQUATION	en
dc.subject.other	EXTRUSION EXPERIMENTS	en
dc.subject.other	PREDICTION	en
dc.subject.other	POLYETHYLENE	en
dc.subject.other	CONTRACTION	en
dc.subject.other	SWELL	en
dc.title	Numerical simulation of entry flow of fluid S1	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	Numerical simulations have been undertaken for the creeping flow of a well-characterized polymer solution (fluid S1) in the benchmark problem of the entry flow in a 4:1 axisymmetric contraction. The fluid has been modelled using an integral constitutive equation of the K-BKZ type with a spectrum of relaxation times. Numerical values for the constants appearing in the equation have been obtained from fitting shear viscosity and normal stress data as measured in shear: and elongational viscosities both steady-state and transient. Convergence of the numerical scheme was obtained for the whole range of experiments previously performed by Byars et al., J. Non-Newtonian Fluid Mech. 72 (1997) 219-235. The numerical solutions show that the vortex in the reservoir increases monotonically with increasing flow rate (or Weissenberg number) in agreement with the experiments. For identical flow conditions, a sudden contraction shows a higher vortex growth than a contraction with a rounded re-entrant corner, again in agreement with experiments. (C) 1998 Elsevier Science B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	JOURNAL OF NON-NEWTONIAN FLUID MECHANICS	en
dc.identifier.isi	ISI:000074719100005	en
dc.identifier.volume	78	en
dc.identifier.issue	2-3	en
dc.identifier.spage	187	en
dc.identifier.epage	201	en