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Experimental investigation on the dynamic characteristics of molten droplets and high-temperature particles falling in coolant
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2010 (English)In: 6TH INTERNATIONAL SYMPOSIUM ON MULTIPHASE FLOW, HEAT MASS TRANSFER AND ENERGY CONVERSION / [ed] Guo LJ; Joseph DD; Matsumoto Y; Sommerfeld M; Wang YS, 2010, Vol. 1207, 292-299 p.Conference paper (Refereed)
Abstract [en]

This paper presents the dynamic characteristics of molten droplets and hot particles at the very beginning of their falling into coolant pools, which are of importance to the subsequent interactions such as fragmentation of the droplets in coolants. The falling course of a single droplet or a single hot particle was recorded by a high-speed camera and a curve of velocity vs. time was obtained. Emphasis was placed on the effects of the droplet's size and temperature, the coolant's temperature and properties, and the droplet's physical properties on the moving behavior. Tests with hot particles were also performed for a comparison with the droplets. The results for the all cases showed that the velocity of a falling droplet/particle decreased rapidly but rebounded shortly, at the beginning of droplet/particle falling in the coolant. Following such a V-shaped evolution in velocity, the droplet/particle slows down gradually till a comparatively steady velocity. An increase in either coolant temperature or droplet temperature results in a larger velocity variation in the "J-region", but a smaller deceleration after it moves out of the "J-region". The elevated volatility of a coolant leads to a steeper deceleration in the "J-region" and beyond. The bigger size of a particle leads to a greater velocity variation in the "J-region" and terminal velocity. A high melting point and thermal conductivity as well as lower heat capacity contribute to dramatic variation in the "J-region" and low terminal velocity.

Place, publisher, year, edition, pages
2010. Vol. 1207, 292-299 p.
, AIP Conference Proceedings, ISSN 0094-243X
Keyword [en]
droplet, movement characteristics, fuel and coolant interactions, multiphase flow
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-29628ISI: 000280504500041ScopusID: 2-s2.0-77950110647ISBN: 978-0-7354-0744-2OAI: diva2:408526
6th International Symposium on Multiphase Flow, Heat Mass Transfer and Energy Conversion
QC 20110405Available from: 2011-04-05 Created: 2011-02-11 Last updated: 2011-04-05Bibliographically approved

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