Steady flow simulations of compressible PTFE paste extrusion under severe wall slip

Mitsoulis, E; Hatzikiriakos, SG

dc.contributor.author	Mitsoulis, E	en
dc.contributor.author	Hatzikiriakos, SG	en
dc.date.accessioned	2014-03-01T01:31:59Z
dc.date.available	2014-03-01T01:31:59Z
dc.date.issued	2009	en
dc.identifier.issn	0377-0257	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20001
dc.subject	Axisymmetric contraction	en
dc.subject	Compressibility	en
dc.subject	Flow type parameter	en
dc.subject	Paste extrusion	en
dc.subject	Polytetrafluoroethylene	en
dc.subject	Slip law	en
dc.subject	Structural parameter	en
dc.subject.classification	Mechanics	en
dc.subject.other	Compressibility	en
dc.subject.other	Dies	en
dc.subject.other	Extrusion	en
dc.subject.other	Extrusion dies	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Incompressible flow	en
dc.subject.other	Laws and legislation	en
dc.subject.other	Mathematical models	en
dc.subject.other	Plastic flow	en
dc.subject.other	Rheology	en
dc.subject.other	Shrinkage	en
dc.subject.other	Walls (structural partitions)	en
dc.subject.other	Axisymmetric contraction	en
dc.subject.other	Flow type parameter	en
dc.subject.other	Paste extrusion	en
dc.subject.other	Slip law	en
dc.subject.other	Structural parameter	en
dc.subject.other	Flow simulation	en
dc.title	Steady flow simulations of compressible PTFE paste extrusion under severe wall slip	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jnnfm.2008.09.003	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jnnfm.2008.09.003	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	In a recent article [P.D. Patil, J.J. Feng, S.C. Hatzikiriakos, Constitutive modelling and flow simulation of polytetrafluoroethylene paste extrusion, J. Non-Newtonian Fluid Mech., 139 (2006) 44-53]. a rheological constitutive equation was proposed to model the flow of polytetrafluoroethylene (PTFE) paste. Steady-state flow simulations were carried out, governed by the conservation equations of mass and momentum under isothermal, incompressible conditions, and taking into account a linear slip law at the wall due to the presence of lubricant in the paste. The constitutive model was a combination of shear-thinning and shear-thickening viscosity terms. depending on a structural parameter, xi, which obeyed a convective-transport equation. The present work re-examines the flow problem, taking into account the significant compressibility of the paste and implementing the slip law based on the consistent normal-to-the-surface unit vector. New results are shown as contours of the xi-parameter in the flow field as well as contours of the flow type parameter. psi, used in the model. They offer a better understanding of the flow behaviour of PTFE in now through extrusion dies. (C) 2008 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.2008.09.003	en
dc.identifier.isi	ISI:000263499500003	en
dc.identifier.volume	157	en
dc.identifier.issue	1-2	en
dc.identifier.spage	26	en
dc.identifier.epage	33	en