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Slip effects in tapered dies

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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


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