Numerical Simulation of the Film Casting Process

Beaulne, M; Mitsoulis, E

dc.contributor.author	Beaulne, M	en
dc.contributor.author	Mitsoulis, E	en
dc.date.accessioned	2014-03-01T01:14:53Z
dc.date.available	2014-03-01T01:14:53Z
dc.date.issued	1999	en
dc.identifier.issn	0930-777X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13269
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0347139448&partnerID=40&md5=8d7bbf7696c152d5909aecf9120b3ad7	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Polymer Science	en
dc.subject.other	MODIFIED GIESEKUS FLUIDS	en
dc.subject.other	VISCOELASTIC LIQUID	en
dc.subject.other	EXTRUSION	en
dc.subject.other	STABILITY	en
dc.subject.other	MODELS	en
dc.subject.other	FLOWS	en
dc.subject.other	MELT	en
dc.title	Numerical Simulation of the Film Casting Process	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	Numerical simulations have been undertaken for the filmcasting process with viscoelastic fluids. Viscoelasticity is described by an integral constitutive equation of the K-BKZ type with a spectrum of relaxation times, which fits well experimental data for shear and extensional viscosities and the normal stresses measured in shear flow. Non-isothermal conditions are considered by applying the Morland-Lee hypothesis, which incorporates the appropriate shift factor and pseudo-time into the constitutive equation. A one-dimensional model derived from the conservation of momentum is used to approximate the thickness, while the stress free-surface condition is used to approximate the width. The resulting system of differential equations is solved using the finite element method and the Newton-Raphson iterative scheme. The method of solution was first checked against the Newtonian and Maxwell results for different film geometries. The simulations are compared to available experimental data and previous simulations in terms of film thickness, film width, and film temperature. Agreement between the experiments and the current simulations is considered good with subtle differences. Agreement is also considered good between the current one-dimensional simulations and previous two-dimensional simulations for viscoelastic fluids, in terms of width and thickness. The one-dimensional model is advantageous since the algorithm is relatively simple, convergence is almost guaranteed, and the computing time is short.	en
heal.publisher	CARL HANSER VERLAG	en
heal.journalName	International Polymer Processing	en
dc.identifier.isi	ISI:000083217300009	en
dc.identifier.volume	14	en
dc.identifier.issue	3	en
dc.identifier.spage	261	en
dc.identifier.epage	275	en