Free surface effects in squeeze flow of Bingham plastics

Mitsoulis, E; Matsoukas, A

dc.contributor.author	Mitsoulis, E	en
dc.contributor.author	Matsoukas, A	en
dc.date.accessioned	2014-03-01T01:22:26Z
dc.date.available	2014-03-01T01:22:26Z
dc.date.issued	2005	en
dc.identifier.issn	0377-0257	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16567
dc.subject	Bingham plastic	en
dc.subject	Free surface effects	en
dc.subject	Squeeze flow	en
dc.subject	Squeeze force	en
dc.subject	Viscoplasticity	en
dc.subject	Yield stress	en
dc.subject.classification	Mechanics	en
dc.subject.other	Aspect ratio	en
dc.subject.other	Calculations	en
dc.subject.other	Computational fluid dynamics	en
dc.subject.other	Computational geometry	en
dc.subject.other	Computer simulation	en
dc.subject.other	Deformation	en
dc.subject.other	Equations of motion	en
dc.subject.other	Surface phenomena	en
dc.subject.other	Viscoplasticity	en
dc.subject.other	Yield stress	en
dc.subject.other	Bingham plastics	en
dc.subject.other	Free surface effects	en
dc.subject.other	Geometry effects	en
dc.subject.other	Quasi-steady-state simulations	en
dc.subject.other	Squeeze flow	en
dc.subject.other	Squeeze force	en
dc.subject.other	Non Newtonian flow	en
dc.subject.other	aspect ratio	en
dc.subject.other	Bingham fluid	en
dc.subject.other	mathematical modeling	en
dc.subject.other	plastic flow	en
dc.subject.other	viscoplastic flow	en
dc.subject.other	yield stress	en
dc.title	Free surface effects in squeeze flow of Bingham plastics	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jnnfm.2005.06.002	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jnnfm.2005.06.002	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	New results for the squeeze flow of Bingham plastics show the shape of the free surface in quasi-steady-state simulations, and its effect on the yielded/unyielded regions and the squeeze force. The present simulation results are obtained for both planar and axisymmetric geometries as in our previous paper [A. Matsoukas, E. Mitsoulis, Geometry effects in squeeze flow of Bingham plastics, J. Non-Newtonian Fluid Mech. 109 (2003) 231-240] and for aspect ratios ranging from 0.01 to 1. Bigger aspect ratios produce more free surface movement relative to the disk radius or plate length, but less movement relative to the gap. Planar geometries give more free surface movement than axisymmetric ones. Viscoplasticity serves to reduce the free surface movement and its deformation. In some cases of planar geometries and big aspect ratios, unyielded regions appear at the free surface, while the small unyielded regions near the center of the disks or plates are not affected. Including the free surface in the calculations of the squeeze force adds a small percentage to the values depending on aspect ratio and Bingham number. The previously fitted easy-to-use equations are corrected to account for that effect. (c) 2005 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.2005.06.002	en
dc.identifier.isi	ISI:000232670700006	en
dc.identifier.volume	129	en
dc.identifier.issue	3	en
dc.identifier.spage	182	en
dc.identifier.epage	187	en