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Experiments on thermal interactions: Tests with Al{sub 2}O{sub 3} droplets and water

Technical Report:

Abstract

Within the analysis of severe highly hypothetical fast breeder accidents the consequences of a fuel-coolant interaction have to be considered, i.e. the thermal interaction between hot molten fuel and sodium. To improve principal knowledge on the fragmentation process during the interaction of a hot droplet with a cold fluid, a series of experiments was performed with single droplets of molten Al{sub 2}O{sub 3} as the hot liquid and water as the cold and easily volatile fluid. To initiate fragmentation of the droplet pressure pulses of up to 1 MPa were generated in the water by a magnetic hammer. The events were filmed by a high speed camera with up to 10{sup 5} pictures per second. Details of the interactions can be deduced from the films and from the pressure histories. The existence of a vapour trail in all experiments indicates complex heat and mass transfer processes occurring in the vapour film spontaneously formed between droplet and cold fluid. Fragmentation was initiated by local events in the vapour trail area. (orig.). [Deutsch] Bei der Analyse von schweren, hypothetischen Schnellbrueterstoerfaellen sind die Auswirkungen einer thermischen Wechselwirkung des heissen Brennstoffes mit Natrium zu beruecksichtigen. Um das allgemeine Verstaendnis des entscheidenden Reaktionsvorgangs bei der  More>>
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
KFK-4891
Reference Number:
SCA: 220900; 210500; PA: DEN-92:000143; SN: 92000629761
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; LMFBR TYPE REACTORS; MELTDOWN; FUEL-COOLANT INTERACTIONS; REACTOR SAFETY EXPERIMENTS; SIMULATION; DROPLETS; ALUMINIUM OXIDES; WATER; FRAGMENTATION; HEAT TRANSFER; MASS TRANSFER; 220900; 210500; REACTOR SAFETY; POWER REACTORS, BREEDING
OSTI ID:
10108950
Research Organizations:
Kernforschungszentrum Karlsruhe GmbH (Germany). Inst. fuer Reaktorentwicklung (IRE); Kernforschungszentrum Karlsruhe GmbH (Germany). Projekt Nukleare Sicherheitsforschung
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE92750188; TRN: DE9200143
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
91 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Peppler, W, Till, W, and Kaiser, A. Experiments on thermal interactions: Tests with Al{sub 2}O{sub 3} droplets and water. Germany: N. p., 1991. Web.
Peppler, W, Till, W, & Kaiser, A. Experiments on thermal interactions: Tests with Al{sub 2}O{sub 3} droplets and water. Germany.
Peppler, W, Till, W, and Kaiser, A. 1991. "Experiments on thermal interactions: Tests with Al{sub 2}O{sub 3} droplets and water." Germany.
@misc{etde_10108950,
title = {Experiments on thermal interactions: Tests with Al{sub 2}O{sub 3} droplets and water}
author = {Peppler, W, Till, W, and Kaiser, A}
abstractNote = {Within the analysis of severe highly hypothetical fast breeder accidents the consequences of a fuel-coolant interaction have to be considered, i.e. the thermal interaction between hot molten fuel and sodium. To improve principal knowledge on the fragmentation process during the interaction of a hot droplet with a cold fluid, a series of experiments was performed with single droplets of molten Al{sub 2}O{sub 3} as the hot liquid and water as the cold and easily volatile fluid. To initiate fragmentation of the droplet pressure pulses of up to 1 MPa were generated in the water by a magnetic hammer. The events were filmed by a high speed camera with up to 10{sup 5} pictures per second. Details of the interactions can be deduced from the films and from the pressure histories. The existence of a vapour trail in all experiments indicates complex heat and mass transfer processes occurring in the vapour film spontaneously formed between droplet and cold fluid. Fragmentation was initiated by local events in the vapour trail area. (orig.). [Deutsch] Bei der Analyse von schweren, hypothetischen Schnellbrueterstoerfaellen sind die Auswirkungen einer thermischen Wechselwirkung des heissen Brennstoffes mit Natrium zu beruecksichtigen. Um das allgemeine Verstaendnis des entscheidenden Reaktionsvorgangs bei der Wechselwirkung eines heissen Tropfens mit einer kalten Fluessigkeit zu verbessern, wurde eine Versuchsreihe mit Einzeltropfen aus schmelzfluessigem Al{sub 2}O{sub 3} als heisse Fluessigkeit und Wasser als kalte, leichtfluechtige Fluessigkeit durchgefuehrt. Die Fragmentation des Tropfens wurde ueber einen Magnethammer eingeleitet, der Druckpulse im Wasser bis zu 1 MPa erzeugte. Das Versuchsgeschehen wurde von einer Hochgeschwindigkeitskamera mit bis zu 10{sup 5} Bildern pro Sekunde aufgenommen. Aus den Filmen und aus dem Druckverlauf lassen sich Einzelheiten der Wechselwirkungen ableiten. Die Existenz einer Dampfschleppe in allen Versuchen weist auf komplexe Waerme- und Stofftransportvorgaenge in dem zwischen Tropfen und kalter Fluessigkeit spontan sich bildenden Dampffilm hin. Die Fragmentation wurde durch lokale Vorgaenge im Bereich der Dampfschleppe ausgeloest. (orig.).}
place = {Germany}
year = {1991}
month = {Sep}
}