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dc.contributor.CRUESPUNIVERSIDADE DE ESTADUAL DE CAMPINASpt_BR
dc.typeArtigo de Periódicopt_BR
dc.titleNumerical And Experimental Modelling Of Two-dimensional Unsteady Heat Transfer During Inward Solidification Of Square Billetspt_BR
dc.contributor.authorBertellipt_BR
dc.contributor.authorF; Fariapt_BR
dc.contributor.authorJD; Goulartpt_BR
dc.contributor.authorPR; Britopt_BR
dc.contributor.authorC; Cheungpt_BR
dc.contributor.authorN; Garciapt_BR
dc.contributor.authorApt_BR
unicamp.author.emailcheung@fem.unicamp.brpt_BR
dc.subjectHeat Transferpt_BR
dc.subjectSolidificationpt_BR
dc.subjectNumerical Simulationpt_BR
dc.subjectMetal/coolant Heat Transfer Coefficientpt_BR
dc.subjectPhase Changept_BR
dc.subjectAlloyspt_BR
dc.description.abstractThe development of air gaps between the solidifying shell and the mould is an inherent phenomenon in both continuous and static casting processes, and is one of the major factors affecting not only the microstructure formation but also the resulting properties and surface quality of castings. The heat flux transients at the casting/mould interface therefore attracted many attempts of mathematical modelling. In this study, an explicitly solved unsteady-state two-dimensional finite difference heat transfer model was used for the solution of the inverse heat conduction problem. The overall heat transfer coefficient between the casting surface and the cooling fluid (h(g)) - which is affected by a series of thermal resistances such as those from water, mould and air gap formed between the metal surface and the inner mould surface - is determined for the inward solidification of a hypoeutectic Al-Fe alloy casting in a water-cooled steel mould. Thermocouples were inserted into the casting with a view to continuously measure temperatures during solidification, which is necessary to furnish thermal information to be compared with simulations, and an automatic search selected the best theoretical-experimental fit from a range of transient heat transfer coefficient profiles. The microstructural cellular spacing was measured in order to permit correlations with the cooling rate ((T)over dot) at different positions from the metal/mould interface to be established. It is shown by numerical heat transfer simulations that the cooling rate decreases from the casting surface, and after reaching a minimum value, starts to increase characterising a reversal trend towards the centre of the casting. It is also shown that the cellular spacing accompanies the trend in the cooling rate. The obtained results - transient (h(g)) profiles and growth laws relating the cellular spacing to () - can contribute to a better understanding of transport phenomena and microstructure evolution of more complex processes involving transient solidification. (C) 2016 Elsevier Ltd. All rights reserved.en
dc.relation.ispartofApplied Thermal Engineeringpt_BR
dc.publisher.cityOXFORDpt_BR
dc.publisherPERGAMON-ELSEVIER SCIENCE LTDpt_BR
dc.date.issued2016pt_BR
dc.identifier.citationApplied Thermal Engineering. PERGAMON-ELSEVIER SCIENCE LTD, n. 96, p. 454 - 462.pt_BR
dc.language.isoEnglishpt_BR
dc.description.volume96pt_BR
dc.description.issuenumberpt_BR
dc.description.firstpage454pt_BR
dc.description.lastpage462pt_BR
dc.rightsfechadopt_BR
dc.sourceWOSpt_BR
dc.identifier.issn1359-4311pt_BR
dc.identifier.wosidWOS:000373863400047pt_BR
dc.identifier.doi10.1016/j.applthermaleng.2015.11.121pt_BR
dc.identifier.urlhttp://www-sciencedirect-com.ez88.periodicos.capes.gov.br/science/article/pii/S1359431115013708pt_BR
dc.description.sponsorshipFAPESP-Sao Paulo Research Foundation, Brazil [2012/08494-0, 2012/16328-2, 2013/23396-7]pt_BR
dc.description.sponsorshipCNPq (The Brazilian Research Council)pt_BR
dc.description.sponsorship1Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)pt_BR
dc.description.sponsorship1Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)pt_BR
dc.date.available2016-12-06T18:31:17Z-
dc.date.accessioned2016-12-06T18:31:17Z-
dc.description.provenanceMade available in DSpace on 2016-12-06T18:31:17Z (GMT). No. of bitstreams: 1 000373863400047.pdf: 2055163 bytes, checksum: e62aa1a382e2685fea88ba255762c5e2 (MD5) Previous issue date: 2016en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/320261-
dc.description.conferencelocationpt_BR
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