Visualization of filament from molten copper droplet before vapor explosion in highly-subcooled water pool

Takahiro Arai, Masahiro Furuya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Experiments were conducted in which a molten copper droplet was released into a pool of water. Spontaneous vapor explosion did not occur when the water temperature was 50°C or higher. Spontaneous vapor explosions, however, occurred at a rate of 70% when water temperature was 20°C A series of high-speed video images explores the triggering process of spontaneous vapor explosions: (1) when a molten copper droplet is released into pool of water, a vapor film forms and separates the copper droplet and the surrounding water that is a boiling film, (2) a filament of molten copper grows from the surface and deforms the vapor film, (3) since the filament of molten copper has a small heat capacity and is rapidly quenched, the vapor film condenses along its surface, and the molten copper droplet around the filament directly contacts water, and finally (4) triggering of spontaneous vapor explosions occurs from the filament to the whole molten copper droplet. When filament growth was observed, it triggered a spontaneous vapor explosion in almost all cases. When filament growth was not observed, spontaneous vapor explosions were not observed and vapor films therefore stably formed around the molten copper droplets. The authors thus conclude that filaments from the molten copper trigger spontaneous vapor explosions in highly subcooled water.

Original languageEnglish
Title of host publicationProceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12
Publication statusPublished - 2007 Dec 1
Externally publishedYes
Event12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 - Pittsburgh, PA, United States
Duration: 2007 Sep 302007 Oct 4

Publication series

NameProceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12

Conference

Conference12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12
CountryUnited States
CityPittsburgh, PA
Period07/9/3007/10/4

Fingerprint

Explosions
explosions
Molten materials
filaments
Visualization
Vapors
vapors
Copper
copper
water
Water
water temperature
film boiling
Contacts (fluid mechanics)
Boiling liquids
Specific heat
actuators
high speed
specific heat
Temperature

Keywords

  • Copper
  • Filament
  • Subcooled water
  • Vapor explosion
  • Vapor film collapse

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Nuclear and High Energy Physics

Cite this

Arai, T., & Furuya, M. (2007). Visualization of filament from molten copper droplet before vapor explosion in highly-subcooled water pool. In Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12 (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).

Visualization of filament from molten copper droplet before vapor explosion in highly-subcooled water pool. / Arai, Takahiro; Furuya, Masahiro.

Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. 2007. (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Arai, T & Furuya, M 2007, Visualization of filament from molten copper droplet before vapor explosion in highly-subcooled water pool. in Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12, 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12, Pittsburgh, PA, United States, 07/9/30.
Arai T, Furuya M. Visualization of filament from molten copper droplet before vapor explosion in highly-subcooled water pool. In Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. 2007. (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).
Arai, Takahiro ; Furuya, Masahiro. / Visualization of filament from molten copper droplet before vapor explosion in highly-subcooled water pool. Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12. 2007. (Proceedings - 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH-12).
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AB - Experiments were conducted in which a molten copper droplet was released into a pool of water. Spontaneous vapor explosion did not occur when the water temperature was 50°C or higher. Spontaneous vapor explosions, however, occurred at a rate of 70% when water temperature was 20°C A series of high-speed video images explores the triggering process of spontaneous vapor explosions: (1) when a molten copper droplet is released into pool of water, a vapor film forms and separates the copper droplet and the surrounding water that is a boiling film, (2) a filament of molten copper grows from the surface and deforms the vapor film, (3) since the filament of molten copper has a small heat capacity and is rapidly quenched, the vapor film condenses along its surface, and the molten copper droplet around the filament directly contacts water, and finally (4) triggering of spontaneous vapor explosions occurs from the filament to the whole molten copper droplet. When filament growth was observed, it triggered a spontaneous vapor explosion in almost all cases. When filament growth was not observed, spontaneous vapor explosions were not observed and vapor films therefore stably formed around the molten copper droplets. The authors thus conclude that filaments from the molten copper trigger spontaneous vapor explosions in highly subcooled water.

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