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Cavity Formation in Particles Obtained from a High Temperature Oxidic Melt Jet Disintegration in Water
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.ORCID iD: 0000-0002-0683-9136
2010 (English)In: 7th International Conference on Multiphase Flow - ICMF 2010 Proceedings, International Conference on Multiphase Flow (ICMF) , 2010, 11.6.2- p.Conference paper (Refereed)
Abstract [en]

Present work is motivated by numerous observations of cavities which regularly appear inside debris particles formed as a result of quenching of high temperature molten oxidic jet in a water pool (Kudinov et al. 2010). The cavity is open with a small hole in the particle surface. The cavities and the holes are observed inside particles with diameters down to few hundreds of microns. In the paper we explore physical mechanisms which could be responsible for the formation of the cavities and the holes and propose an explanation for why the cavities and the holes appear so regularly in wide ranges of particle sizes. We demonstrate that one of the key phenomena for the hole formation is non-uniformity of the film boiling heat flux over the surface of the particle falling in a water pool. To verify our hypotheses we perform simulations of transient process of molten droplet solidification taking into account of changes in densities of liquid and solid phase of melt material. Sensitivity study shows conditions at which non-uniformity of the heat flux distribution has significant effect on the morphology of the cavity.

Place, publisher, year, edition, pages
International Conference on Multiphase Flow (ICMF) , 2010. 11.6.2- p.
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-53625OAI: diva2:470488
7th International Conference on Multiphase Flow - ICMF 2010, Tampa, Florida, USA, 30/5 - 4/6 2010
QC 20120120Available from: 2011-12-29 Created: 2011-12-29 Last updated: 2012-01-20Bibliographically approved

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