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Fine fragmentation of molten droplet in highly subcooled water due to vapor explosion observed by X-ray radiography
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
2005 (English)In: Experimental Thermal and Fluid Science, ISSN 0894-1777, E-ISSN 1879-2286, Vol. 29, no 3, p. 351-361Article in journal (Refereed) Published
Abstract [en]

Experimental investigation of the fine fragmentation process during vapor explosion was conducted in a single drop system employing continuous high-speed X-ray radiography and photography. A molten tine drop of 0.7 g at 1000 degreesC was dropped into a water pool, at highly subcooled temperatures of about 20 degreesC, and the explosion was triggered by an external shock pulse of about 1 MPa. X-ray radiographs show that a shell of finely fragmented melt particles accelerates to the vapor bubble boundary during the period of vapor bubble expansion in the explosion process. For tests with highly subcooled coolant, a local explosion due to an external trigger pulse resulted in the stratified explosion along the melt surface. An analysis to estimate mixing depth during the stratified explosion indicated that about 20% of droplet mass was fragmented due to the stratified explosion with a 1 MPa trigger pulse. Finely particles generated during the vapor explosion process were quantified from high-speed X-ray radiography images.

Place, publisher, year, edition, pages
2005. Vol. 29, no 3, p. 351-361
Keywords [en]
fine fragmentation, X-ray radiography, single droplet, vapor explosion
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-42620DOI: 10.1016/j.expthermflusci.2004.05.013ISI: 000226571600012Scopus ID: 2-s2.0-9944226726OAI: oai:DiVA.org:kth-42620DiVA, id: diva2:447574
Note
QC 20111012. Available from: 2011-10-12 Created: 2011-10-11 Last updated: 2017-12-08Bibliographically approved

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