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The effect of thermal radiation on the solidification dynamics of metal oxide melt droplets
KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnkraftsäkerhet.
2008 (engelsk)Inngår i: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 238, nr 6, 1421-1429 s.Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Cooling and solidification of metal oxide droplets in water are considered, using a single-particle model which takes into account heat conduction and thermal radiation transfer within the particle. It is shown that, for millimeter-size particles, near-infrared absorption of the particle's substance determines the solidification pattern and dynamics. For semi-transparent aluminum oxide particles, the rate of surface solidification is controlled by convective heat transfer. For opaque corium particles, thermal radiation from the particle surface leads to fast surface solidification. The impact of so-formed crust layer on subsequent particle fragmentation is discussed with respect to its influence on steam explosion.

sted, utgiver, år, opplag, sider
2008. Vol. 238, nr 6, 1421-1429 s.
Emneord [en]
fuel-coolant interaction, heat-transfer, semitransparent particles, vapor explosions, absorption, debris, water, temperature, zirconia, model
Identifikatorer
URN: urn:nbn:se:kth:diva-17553DOI: 10.1016/j.nucengdes.2007.10.010ISI: 000256122700015Scopus ID: 2-s2.0-42249094509OAI: oai:DiVA.org:kth-17553DiVA: diva2:335597
Merknad
QC 20100525Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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