The effect of slip in the flow of a branched PP melt: Experiments and simulations

Mitsoulis, E; Kazatchkov, IB; Hatzikiriakos, SG

dc.contributor.author	Mitsoulis, E	en
dc.contributor.author	Kazatchkov, IB	en
dc.contributor.author	Hatzikiriakos, SG	en
dc.date.accessioned	2014-03-01T01:23:11Z
dc.date.available	2014-03-01T01:23:11Z
dc.date.issued	2005	en
dc.identifier.issn	0035-4511	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16858
dc.subject	Axisymmetric contraction	en
dc.subject	Flow visualization	en
dc.subject	Laser-speckle	en
dc.subject	Polypropylene	en
dc.subject	Wall slip	en
dc.subject.classification	Mechanics	en
dc.subject.other	flow visualization	en
dc.subject.other	melting	en
dc.subject.other	polymer	en
dc.subject.other	polypropylene	en
dc.subject.other	slip	en
dc.title	The effect of slip in the flow of a branched PP melt: Experiments and simulations	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s00397-004-0423-2	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s00397-004-0423-2	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	In this paper visualisation and direct velocity profile measurement experiments for a branched polypropylene melt in a 10:1 axisymmetric contraction demonstrate the onset of wall slip. Video processing of the flow shows the formation of vortices and their diminution with increasing flow rate. Numerical simulations using a multimode K-BKZ viscoelastic and a purely viscous (Cross) model - both of them incorporating a nonlinear slip law - were used to predict the flow kinematics and dynamics as well as to deduce the slip velocity function by performing fitting to the velocity profiles. It was found that the numerical predictions agree well with the experimental results for the velocity profiles, and vortex formation, growth and reduction. It is suggested that such experiments (visualisation of entrance flow and direct velocity profile measurement) can be useful in evaluating the validity of constitutive equations and slip laws in the flow of polymer melts through processing equipment. © Springer-Verlag 2005.	en
heal.publisher	SPRINGER	en
heal.journalName	Rheologica Acta	en
dc.identifier.doi	10.1007/s00397-004-0423-2	en
dc.identifier.isi	ISI:000228729900009	en
dc.identifier.volume	44	en
dc.identifier.issue	4	en
dc.identifier.spage	418	en
dc.identifier.epage	426	en