Calendering pseudoplastic and viscoplastic fluids with slip at the roll surface

Mitsoulis, E; Sofou, S

dc.contributor.author	Mitsoulis, E	en
dc.contributor.author	Sofou, S	en
dc.date.accessioned	2014-03-01T01:23:41Z
dc.date.available	2014-03-01T01:23:41Z
dc.date.issued	2006	en
dc.identifier.issn	0021-8936	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17087
dc.subject.classification	Mechanics	en
dc.subject.other	Calendering	en
dc.subject.other	Mathematical models	en
dc.subject.other	Pressure effects	en
dc.subject.other	Rolls (machine components)	en
dc.subject.other	Viscoplasticity	en
dc.subject.other	Newtonian models	en
dc.subject.other	Pseudoplasticity	en
dc.subject.other	Sheet thickness	en
dc.subject.other	Slip coefficient	en
dc.subject.other	Plastics	en
dc.title	Calendering pseudoplastic and viscoplastic fluids with slip at the roll surface	en
heal.type	journalArticle	en
heal.identifier.primary	10.1115/1.2083847	en
heal.identifier.secondary	http://dx.doi.org/10.1115/1.2083847	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The lubrication approximation theory (LAT) is used to provide numerical results for calendering a sheet from an infinite reservoir. The Herschel-Bulkley model of viscoplasticity is employed, which reduces with appropriate modifications to the Bingham, power-law, and Newtonian models. A dimensionless slip coefficient is introduced to account for the case of slip at the roll surfaces. The results give the final sheet thickness as a function of the dimensionless power-law index (in the case of pseudoplasticity), the Bingham number or the dimensionless yield stress calculated at the nip (in the case of viscoplasticity), and the dimensionless slip coefficient in both cases. Integrated quantities of engineering interest are also calculated. These include the maximum pressure, the roll-separating force, and the power input to the rolls. Decreasing the power-law index or increasing the dimensionless yield stress lead to excess sheet thickness over the thickness at the nip. All engineering quantities calculated in dimensionless form increase substantially with the departure from the Newtonian values. The presence of slip decreases pressure and the engineering quantities and increases the domain in all cases. Copyright © 2006 by ASME.	en
heal.publisher	ASME-AMER SOC MECHANICAL ENG	en
heal.journalName	Journal of Applied Mechanics, Transactions ASME	en
dc.identifier.doi	10.1115/1.2083847	en
dc.identifier.isi	ISI:000236193000015	en
dc.identifier.volume	73	en
dc.identifier.issue	2	en
dc.identifier.spage	291	en
dc.identifier.epage	299	en