Roll-over-web coating of pseudoplastic and viscoplastic sheets using the lubrication approximation

Sofou, S; Mitsoulis, E

dc.contributor.author	Sofou, S	en
dc.contributor.author	Mitsoulis, E	en
dc.date.accessioned	2014-03-01T01:23:02Z
dc.date.available	2014-03-01T01:23:02Z
dc.date.issued	2005	en
dc.identifier.issn	8756-0879	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16778
dc.subject	Herschel-Bulkley model	en
dc.subject	Pseudoplasticity	en
dc.subject	Roll-over-web coating	en
dc.subject	Viscoplasticity	en
dc.subject	Yield line	en
dc.subject	Yield stress	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.other	Approximation theory	en
dc.subject.other	Lubrication	en
dc.subject.other	Mathematical models	en
dc.subject.other	Plastic coatings	en
dc.subject.other	Viscoplasticity	en
dc.subject.other	Yield stress	en
dc.subject.other	Herschel-Bulkley model	en
dc.subject.other	Pseudoplastic sheets	en
dc.subject.other	Pseudoplasticity	en
dc.subject.other	Roll-over-web coating	en
dc.subject.other	Viscoplastic sheets	en
dc.subject.other	Yield line	en
dc.subject.other	Plastic sheets	en
dc.title	Roll-over-web coating of pseudoplastic and viscoplastic sheets using the lubrication approximation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1177/8756087905059963	en
heal.identifier.secondary	http://dx.doi.org/10.1177/8756087905059963	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	The Lubrication Approximation Theory (LAT) is used to provide numerical results in roll coating over a moving flat web. The Herschel-Bulkley model of viscoplasticity is used, which reduces with appropriate modifications to the Bingham, power-law, and Newtonian models. Results are obtained for such quantities as coating thickness, separation point, and the volumetric flow rate required for various values of the power-law index (in the case of pseudoplasticity) and of the Bingham number (in the case of viscoplasticity). All these values increase substantially with the increasing non-Newtonian character of the fluid. Yielded and unyielded areas are quantitatively shown for several cases of viscoplasticity. Pressure gradient and pressure distributions are given for all cases. Integrated quantities of engineering interest are also calculated. These include the maximum pressure, the roll/sheet separating force, and the power input to the roll. These quantities increase substantially and monotonically in a dimensionless form, as the power-law index decreases or the Bingham number increases. © 2005 SAGE Publications.	en
heal.publisher	SAGE PUBLICATIONS LTD	en
heal.journalName	Journal of Plastic Film and Sheeting	en
dc.identifier.doi	10.1177/8756087905059963	en
dc.identifier.isi	ISI:000233907600004	en
dc.identifier.volume	21	en
dc.identifier.issue	4	en
dc.identifier.spage	307	en
dc.identifier.epage	333	en