Flow behavior of different polyethylenes in capillary flow

Mitsoulis, E; Zisis, T; Ansari, M; Hatzikiriakos, SG

dc.contributor.author	Mitsoulis, E	en
dc.contributor.author	Zisis, T	en
dc.contributor.author	Ansari, M	en
dc.contributor.author	Hatzikiriakos, SG	en
dc.date.accessioned	2014-03-01T02:53:38Z
dc.date.available	2014-03-01T02:53:38Z
dc.date.issued	2012	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36463
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84865762070&partnerID=40&md5=6b0ccefc4d1dc81e83b602a15d5b3a91	en
dc.subject	Capillary flow	en
dc.subject	Flow behavior	en
dc.subject	Polyethylene melts	en
dc.subject.other	Capillary dies	en
dc.subject.other	Engineering plastics	en
dc.subject.other	Experimental data	en
dc.subject.other	Flow behaviors	en
dc.subject.other	Flow behaviours	en
dc.subject.other	Flow properties	en
dc.subject.other	Flowthrough	en
dc.subject.other	L/D ratio	en
dc.subject.other	Low density	en
dc.subject.other	Polyethylene melt	en
dc.subject.other	Pressure dependence	en
dc.subject.other	Rheological characterization	en
dc.subject.other	Viscous dissipation	en
dc.subject.other	Capillarity	en
dc.subject.other	Capillary flow	en
dc.subject.other	Flow fields	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Plastic products	en
dc.subject.other	Rheology	en
dc.subject.other	Thermoplastics	en
dc.subject.other	High density polyethylenes	en
dc.title	Flow behavior of different polyethylenes in capillary flow	en
heal.type	conferenceItem	en
heal.publicationDate	2012	en
heal.abstract	Three major polyethylene (PE) engineering plastics, linear-low-density (LLDPE), low-density (LDPE) and high-density (HDPE) are studied in capillary flow. The purpose is to find experimentally and predict numerically their flow behaviour, namely the pressure drop in flow through tapered dies. This behavior is related to their individual rheological and flow properties. Using a series of capillary dies having different diameters D and length-to-diameter L/D ratios, a full rheological characterization has been carried out, and the experimental data have been fitted with the viscoelastic K-BKZ/PSM model. The branched LDPE has a strong pressure-dependence of viscosity, with a pressure-dependent coefficient βp. For the linear LLDPE and HDPE melts, the pressure-dependence of viscosity is weak, but slip at the wall is strong and affects their flow behaviour. Thermal effects due to viscous dissipation are included but are rather mild. It is found that the viscoelastic simulations are capable of reproducing the experimental data well, in the whole range of apparent shear rates and L/D ratios.	en
heal.journalName	Annual Technical Conference - ANTEC, Conference Proceedings	en
dc.identifier.volume	1	en
dc.identifier.spage	824	en
dc.identifier.epage	829	en