Phreatic explosion
The phreatic explosion (すいじょうきばくはつ, English: phreatic explosion) is an explosion phenomenon to be vaporized by water contacting a material having very high temperature, and to occur.
Table of contents
Summary
It is a thing same as what play it intensely when I drip a drop of water to the frying pan which I heated as a phenomenon, and fly. When a large quantity of water and a high temperature heat source touch it because a volume doubles approximately 1,700 when the water is heated and becomes the steam, I have the increase of the volume by the momentary evaporation of the water, and it becomes the explosion.
Classification
It is classified roughly to two kinds of an interface contact type (contact-surface steam explosivity) and the whole reaction type (bulk interaction steam explosivity) [1].
- Interface contact type
- When the hot infinitesimal grain material such as the metal melt falls in water, a film of the thin steam is formed in the people. I call this state "rough mixture", and this film exists for stability for a while, but I destabilize it, and I am destroyed with a shock wave by some kind of causes. I call this destruction phenomenon the phreatic explosion of the interface contact type. When a high temperature material drops in a coolant when meltdown occurred in a nuclear reactor, this type of phreatic explosion may occur.
- Whole reaction type
- The phreatic explosion of the type that water in the sealing up space suddenly vaporizes by heat and that the material which I sealed by expanding is crushed at a stretch and gets up. For example, I have this type of phreatic explosion when a large quantity of steam suddenly occurs when there is an aquifer in the space that I sealed up that is in the earth crust by magma penetrating it there. I call it a phreatomagmatic explosion in particular on this occasion when the magma is released together. In addition, it is suggested that the eruption of the degree to spout out refers the volcanic ashes that the phreatic explosion is not so explosive to steam eruption in 含 まれまれるため, Japan by some vulcanologists [2].
Example
- Volcano
- Famous phreatic explosion in Japan is eruption of Aizu Mount Bandai of 1888 and eruption of Nishinoshima Niijima of 1973. In the former, phreatic explosion occurred in a heap of Mount Bandai body part, and a rock waste snowslide occurred with mountain body collapse and started 477 dead people, and the Nagase River and the branch were dammed up, and, including Lake Hibara, Lake Onogawa, Lake Akimoto, five colors of marshes, large and small wetlands were formed.
- Meltdown of the nuclear reactor
- When the melt drops in a coolant, the zircalloy used for a fuel coating pipe in many nuclear reactors causes phreatic explosion including fusion at 1,400 degrees Celsius.
- Cooking
- Because the oil which has phreatic explosion, and caught fire is greatly scattered when I take water to put out fire when I am cooking deep-fried food, and oil catches fire, it is due, and a fire might enlarge a burn and is dangerous at all.
References
- Tsukuba University system computer science graduate course Yutaka Abe laboratory reads "the study on steam explosion" on January 11, 2012.
Footnote
- ^ Peter Kokelaar(2005), Magma-water interactions in subaqueous and emergent basaltic, Bulletin of Volcanology, 48, 275-289.
- ^ A definition and scale of the disaster prevention memo eruption The Meteorological Agency
Allied item
- Awa Tunnel
- Dust explosion
- An example of explosion egg - phreatic explosion
This article is taken from the Japanese Wikipedia Phreatic explosion
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