Numerical simulation of rheological effects in fiber spinning

Mitsoulis, E; Beaulne, M

dc.contributor.author	Mitsoulis, E	en
dc.contributor.author	Beaulne, M	en
dc.date.accessioned	2014-03-01T01:15:45Z
dc.date.available	2014-03-01T01:15:45Z
dc.date.issued	2000	en
dc.identifier.issn	0730-6679	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13706
dc.subject	Numerical Simulation	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Polymer Science	en
dc.subject.other	CONSTITUTIVE EQUATION	en
dc.subject.other	VISCOELASTIC LIQUID	en
dc.subject.other	MELT	en
dc.subject.other	EXTRUSION	en
dc.subject.other	MODEL	en
dc.subject.other	POLYPROPYLENE	en
dc.subject.other	MECHANICS	en
dc.subject.other	FLOWS	en
dc.title	Numerical simulation of rheological effects in fiber spinning	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/1098-2329(200023)19:3<155::AID-ADV1>3.0.CO;2-B	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1098-2329(200023)19:3<155::AID-ADV1>3.0.CO;2-B	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The fiber-spinning process is an important industrial operation to manufacture synthetic fibers. The process occurs under free-surface conditions, and the final properties of the fiber are characterized by the extensional properties of the polymer. Specifically, the non-isothermal response of the polymer in uniaxial extension dominates the process. The fiber-spinning process is analyzed by means of a unidirectional approach because the thickness of the fiber is very small with respect to its lateral dimension. The analysis accounts for the prehistory of the material inside the die, based on purely extensional strains. For viscoelastic polymer melts, the constitutive equation must be able to describe adequately the rheological behavior of the polymer in extensional flow. A good candidate for such modeling is the K-BKZ integral constitutive equation, with a spectrum of relaxation times, which captures well the nonlinear viscoelastic response of polymer melts. The non-isothermal response is taken into account with a temperature shift factor utilizing the Morland-Lee hypothesis. The present work includes effects due to gravity, inertia, and air drag, where applicable. Simulation results are compared with experiments on polypropylene (PP), poly(ethylene terephthalate) (PET), and low-density polyethylene (LDPE) melts at low and high speeds. Results are also compared with previous simulations. It is shown that in some cases the extrudate swell at the spinneret exit must be taken into account to accurately predict the drawing forces, which makes a fully two-dimensional analysis a necessity for such operations. (C) 2000 John Wiley & Sons, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	ADVANCES IN POLYMER TECHNOLOGY	en
dc.identifier.doi	10.1002/1098-2329(200023)19:3<155::AID-ADV1>3.0.CO;2-B	en
dc.identifier.isi	ISI:000088565700001	en
dc.identifier.volume	19	en
dc.identifier.issue	3	en
dc.identifier.spage	155	en
dc.identifier.epage	172	en