Investigation of inclusion re-entrainment from the steel-slag interface

Bouris, D; Bergeles, G

dc.contributor.author	Bouris, D	en
dc.contributor.author	Bergeles, G	en
dc.date.accessioned	2014-03-01T01:13:51Z
dc.date.available	2014-03-01T01:13:51Z
dc.date.issued	1998	en
dc.identifier.issn	1073-5623	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12748
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0032095501&partnerID=40&md5=90662a8d23ce649a502e2754442a7de8	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.other	Adhesion	en
dc.subject.other	Boundary layer flow	en
dc.subject.other	Buoyancy	en
dc.subject.other	Inclusions	en
dc.subject.other	Lift	en
dc.subject.other	Particles (particulate matter)	en
dc.subject.other	Shear stress	en
dc.subject.other	Slags	en
dc.subject.other	Steel castings	en
dc.subject.other	Surface tension	en
dc.subject.other	Turbulent flow	en
dc.subject.other	Viscosity	en
dc.subject.other	Turbulent burst theory	en
dc.subject.other	Interfaces (materials)	en
dc.title	Investigation of inclusion re-entrainment from the steel-slag interface	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1998	en
heal.abstract	The mechanism of inclusion elimination from continuous steel casting is investigated at the steel-slag interface. Inclusion impact at the interface is considered under the concept of energy balance, with buoyancy forces, fluid dynamic forces, interfacial adhesion, and rebound forces determining whether the particle will pass through the interface or be retained by it. The effects of the inclusion, slag, and steel properties, as well as the effect of inclusion impact velocity, are considered at the interface. The interfacial tension between the slag and the inclusion should be smaller than that between the steel and the inclusion (negative wettability), so that the inclusions can pass into the slag layer and avoid re-entrainment. The inclusion particles that reach an equilibrium state at the steel-slag interface are subject to re-entrainment back into the steel, due to lift forces applied to them by the turbulent boundary layer at the interface. A removal criterion dependent upon the shear stress is introduced, and then the removal rates are calculated from the turbulent burst theory. It is found that the smaller diameter inclusions are trapped at the interface. Of the particles that remain at the interface, it is the larger ones that are more easily removed by the lift forces due to the turbulent shear stress. High slag viscosity is desirable, since it makes inclusion re-entrainment into the casting product more difficult.	en
heal.publisher	MINERALS METALS MATERIALS SOC	en
heal.journalName	Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science	en
dc.identifier.isi	ISI:000074519700015	en
dc.identifier.volume	29	en
dc.identifier.issue	3	en
dc.identifier.spage	641	en
dc.identifier.epage	649	en