抄録
The spontaneous vapor explosion generated by single drops of molten tin submerged in water is investigated using high-speed photography and pressure trace measurement. The vapor film begins to collapse at the edge of the disk-shaped drops and the collapsed zone spreads over the rest of the drop at a velocity of several meters per second. Explosion experiments in a two-dimensional channel with a narrow space are also carried out to observe more clearly the explosion configuration and the fragmentation process. A model of the spontaneous vapor explosion with a single drop is presented on the basis of experimental observations. In this model, the size of the vapor bubble compared with the cloud of high-temperature debris is assumed to have a strong relationship with heat transfer, and the collapse of the vapor bubble is also assumed to be induced by overexpansion and condensation.
