抄録
In order to study the mechanism of the vapor explosion, we focused on the behavior of a falling water-drop and the force produced by its contact with hot molten metal (Fuji Metal No. 25, or Zinc). The phenomena are classified into the 3 types. Type A corresponds to the vapor explosion, accompanying large sound and large impact. Type B does to the phenomena of smaller impact under the same condition with Type A. The impact of Type C is below 10% of Type A. The water penetration into the molten metal plays an important role for the vapor explosion, relating to the temperature of metal and water-drop, and the fall height.
