Effect of viscoelasticity in the film-blowing process

Beaulne, M; Mitsoulis, E

dc.contributor.author	Beaulne, M	en
dc.contributor.author	Mitsoulis, E	en
dc.date.accessioned	2014-03-01T01:26:13Z
dc.date.available	2014-03-01T01:26:13Z
dc.date.issued	2007	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17970
dc.subject	K-BKZ constitutive equation	en
dc.subject	Nonisothermal film blowing	en
dc.subject	Quasi-one-dimensional approach	en
dc.subject	Viscoelasticity	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Computer simulation	en
dc.subject.other	Differential equations	en
dc.subject.other	Numerical methods	en
dc.subject.other	Relaxation processes	en
dc.subject.other	Viscosity	en
dc.subject.other	Nonisothermal film blowing	en
dc.subject.other	Quasi-one-dimensional approach	en
dc.subject.other	Viscoelasticity	en
dc.subject.other	fluid	en
dc.subject.other	viscoelasticity	en
dc.title	Effect of viscoelasticity in the film-blowing process	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.26325	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.26325	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Numerical simulations have been undertaken for the film-blowing process of viscoelastic fluids under different operating conditions. Viscoelasticity is described by an integral constitutive equation of the K-BKZ type with a spectrum of relaxation times, which can fit the experimental data well for the shear and extensional viscosities and the normal stresses measured in shear flow. Nonisothermal conditions are considered by applying the Morland-Lee hypothesis, which incorporates the appropriate shift factor and pseudo-time into the constitutive equation. The momentum and energy equations are expressed in the machine direction only by using a quasi-one-dimensional approach introduced earlier by Pearson and Petrie. 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 various film characteristics given earlier. The simulations are compared with available experimental data and previous simulations in terms of film shape, velocity, stresses, and temperature. The present results show that the existing modeling of force balances is inadequate for quantitative agreement with the experimental studies. (c) 2007 Wiley Periodicals, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.26325	en
dc.identifier.isi	ISI:000247576600048	en
dc.identifier.volume	105	en
dc.identifier.issue	4	en
dc.identifier.spage	2098	en
dc.identifier.epage	2112	en