Abstract
A simulation on the vapor film thickness around a hot sphere in the subcooled film boiling under a cyclic pressure wave was carried. When the external cyclic pressure wave which has same natural frequency of vapor film applied the vapor film thickness widely changes. It is indicated that the analysis predicts the vapor film becomes instable and the vapor film collapse will occur when its thickness becomes thinner than surface roughness. If a hot sphere is a high temperature molten metal in low temperature water the vapor explosion occurs.
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