Transient capillary rheometry: Compressibility effects

Mitsoulis, E; Delgadillo-Velazquez, O; Hatzikiriakos, SG

dc.contributor.author	Mitsoulis, E	en
dc.contributor.author	Delgadillo-Velazquez, O	en
dc.contributor.author	Hatzikiriakos, SG	en
dc.date.accessioned	2014-03-01T01:27:30Z
dc.date.available	2014-03-01T01:27:30Z
dc.date.issued	2007	en
dc.identifier.issn	0377-0257	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18477
dc.subject	Capillary flow	en
dc.subject	Compressibility	en
dc.subject	LLDPE	en
dc.subject	Transient rheometry	en
dc.subject.classification	Mechanics	en
dc.subject.other	Capillarity	en
dc.subject.other	Compressibility	en
dc.subject.other	Flow rate	en
dc.subject.other	Low density polyethylenes	en
dc.subject.other	Mathematical models	en
dc.subject.other	Rheometers	en
dc.subject.other	Viscous flow	en
dc.subject.other	Pressure transients	en
dc.subject.other	Transient capillary rheometry	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Capillarity	en
dc.subject.other	Compressibility	en
dc.subject.other	Flow rate	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Low density polyethylenes	en
dc.subject.other	Mathematical models	en
dc.subject.other	Rheometers	en
dc.subject.other	Viscous flow	en
dc.title	Transient capillary rheometry: Compressibility effects	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jnnfm.2007.05.004	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jnnfm.2007.05.004	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	The ""rise time"" required to achieve a steady pressure reading in a capillary rheometer operated at constant piston speed can be very short or very long depending on the amount of the material in the barrel, its isothermal compressibility, the flow rate and the geometrical characteristics of the dies used [S.G. Hatzikiriakos, J.M. Dealy, Start-up pressure transients in a capillary rheometer, Polym. Eng. Sci. 34 (1994) 493-499]. When a short die having a large diameter is used, a maximum can also be obtained in the pressure transient, which is solely due to the compressibility of the material. This phenomenon is explained by means of a viscous mathematical model including compressibility, whose predictions are compared with experiments for a molten linear low-density polyethylene (LLDPE). © 2007 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.2007.05.004	en
dc.identifier.isi	ISI:000249550100005	en
dc.identifier.volume	145	en
dc.identifier.issue	2-3	en
dc.identifier.spage	102	en
dc.identifier.epage	108	en