Slip effects in tapered dies

Hatzikiriakos, SG; Mitsoulis, E

dc.contributor.author	Hatzikiriakos, SG	en
dc.contributor.author	Mitsoulis, E	en
dc.date.accessioned	2014-03-01T01:31:56Z
dc.date.available	2014-03-01T01:31:56Z
dc.date.issued	2009	en
dc.identifier.issn	0032-3888	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19981
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Analytical equations	en
dc.subject.other	Contraction angles	en
dc.subject.other	Finite element calculations	en
dc.subject.other	Minimum pressure	en
dc.subject.other	Power law fluid	en
dc.subject.other	Rheological parameter	en
dc.subject.other	Slip condition	en
dc.subject.other	Slip effects	en
dc.subject.other	Taper angles	en
dc.subject.other	Wall slip	en
dc.subject.other	Birefringence	en
dc.subject.other	Dies	en
dc.subject.other	Pressure drop	en
dc.subject.other	Shrinkage	en
dc.title	Slip effects in tapered dies	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/pen.21430	en
heal.identifier.secondary	http://dx.doi.org/10.1002/pen.21430	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	Approximate analytical equations are derived for the calculation of pressure drop of power-law fluids for viscous flow through tapered dies for a wide range of wall-slip conditions. The predicted pressure drop values are compared with two-dimensional (213) finite element calculations to identify contraction angles for which the analytical equations can be used. It is found that the disagreement increases with increase of the contraction angle and with increase of wall slip. At a given flow rate, the pressure drop from the analytical equations is found to decrease continuously with contraction angle, which agrees with the 2D calculations only at small contraction angles. At larger contraction angles, the 2D calculations show that pressure drop increases with contraction angle as opposed to the no-slip case where pressure drop saturates. The existence of a minimum pressure at a specific taper angle depends on the rheological parameters of the fluid and the degree of slip (slip-law exponent), and has scientific importance for the die designer. POLYM. ENG. SCI, 49:1960-1969, 2009. (C) 2009 Society of Plastics Engineers	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Polymer Engineering and Science	en
dc.identifier.doi	10.1002/pen.21430	en
dc.identifier.isi	ISI:000270259900011	en
dc.identifier.volume	49	en
dc.identifier.issue	10	en
dc.identifier.spage	1960	en
dc.identifier.epage	1969	en