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dc.contributor.authorMooney, Robin Patrick
dc.date.accessioned2015-12-02T10:17:46Z
dc.date.available2015-12-02T10:17:46Z
dc.date.issued2015
dc.date.submitted2015
dc.identifier.citationRobin Patrick Mooney, 'A Bridgman Furnace Front Tracking Model', [thesis], Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2015
dc.identifier.otherY
dc.identifier.urihttp://hdl.handle.net/2262/74991
dc.descriptionPUBLISHED
dc.description.abstractThe Bridgman furnace is widely used in industry and research, mainly because it provides a means to directionally solidify materials in a controlled manner, so that the resulting microstructure, and hence material properties, can be manipulated. This thesis details, firstly, the development and verification of a numerical Front Tracking Model (FTM) to track the position of, and growth conditions at, the columnar front during transient directional solidification in a Bridgman furnace; and, secondly, its application to experiments investigating Columnar to Equiaxed Transition (CET) in a gamma TiAl multicomponent hypoperitectic alloy. Previous FTMs have been applied in fixed grid numerical domains where the solidifying material - normally of hypoeutectic composition - is contained within that domain throughout simulations; the model demonstrated here accounts for movement of material through the domain and is adapted for hypoperitectic solidification. The model is applied, firstly, to characterise a Bridgman furnace in terms of heat transfer coefficients and, secondly, to simulate solidification conditions at, and ahead of, the growing columnar front during a unique set of experiments where Bridgman and power down modes of furnace operation are combined in series. The simulations carried out provide valuable insight, specifically, into the growth conditions that lead to CET in a multicomponent gamma TiAl alloy currently of interest to the aerospace industry; and, more generally, into the dynamics of the transient power down solidification process. The results from this work will be used in preparations for planned directional solidification experiments, using a similar gamma TiAl multicomponent alloy, on-board the European Space Agency MAXUS-9 sounding rocket (in microgravity) where a power down technique is employed. The model can be applied elsewhere, in industry and research, to provide insight into solidification conditions occurring in existing Bridgman processes and in the design of new furnaces.
dc.format1 volume
dc.language.isoen
dc.publisherTrinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering
dc.relation.isversionofhttp://stella.catalogue.tcd.ie/iii/encore/record/C__Rb16099852
dc.rightsY
dc.subjectBridgman furnace; solidification; numerical modelling; mechanical engineering; verification; characterisation; metallurgy; phase change; gamma titanium aluminide; power down; directional solidification; dendrite kinetics; columnar to equiaxed transition
dc.subjectEngineering, Ph.D.
dc.subjectPh.D. Trinity College Dublin
dc.subject.lcshBridgman furnace; solidification; numerical modelling; mechanical engineering; verification; characterisation; metallurgy; phase change; gamma titanium aluminide; power down; directional solidification; dendrite kinetics; columnar to equiaxed transition
dc.titleA Bridgman Furnace Front Tracking Model
dc.typethesis
dc.contributor.sponsorEnterprise Ireland
dc.type.supercollectionthesis_dissertations
dc.type.supercollectionrefereed_publications
dc.type.qualificationlevelDoctoral
dc.type.qualificationnameDoctor of Philosophy (Ph.D.)en
dc.identifier.peoplefinderurlhttp://people.tcd.ie/rpmooney
dc.identifier.rssinternalid99928
dc.rights.ecaccessrightsopenAccess
dc.contributor.sponsorGrantNumberEuropean Space Agency (4000107132)
dc.format.extentpaginationpp 162
dc.subject.TCDThemeNanoscience & materials
dc.subject.TCDTagHeat transfer
dc.subject.TCDTagMechanical engineering
dc.subject.TCDTagMetallurgy
dc.subject.TCDTagPhase-change
dc.subject.TCDTagSolidification
dc.subject.TCDTagTransient and unsteady heat transfer
dc.subject.TCDTagFront tracking
dc.subject.TCDTagNumerical modelling
dc.subject.TCDTagVerification
dc.identifier.rssurihttp://www.tara.tcd.ie/handle/2262/73600


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