Experimental　Study　of　Vapor　Exp1Qsions　Caused　by the　Abrupt　Destruction　of　Phase　Equilibrium

Abstract

In　order　to　obtain　the　fundamental　data　to　discuss　the　mechanism　of　vapor　explosio血　caused　by the　abrupt　destruction　of　phase　equilibrium，　a　rupture　disk　was　bfoken　undervarious　conditions　of sevefal　kinds　of　vessels　in　which　the　saturate　water　at　high　pressure　was　contained　and　pressure change　was　measured、　The　results　were　summerized　as　follows： （i）The　phenomena　caused　in　the　vessels　were　explained　from　the　pressure　measurements． （ii）The　evaporation　ratio　alld　the　volume　ratio　of　water　were　calcurated　from　the　initial　conditions，The　maximum　pressure　obtained　in　the　experiment　was　related　to　the　volume ratio.（iii）The　relation　between　opening　hole　ratio　and　maximum pressure　and　weight　of　water　left over　were　discussed．The　pressure　drops　were　related　to　peak　overpressures， （iv）The　limits　above　which　the　overpressures　occured，　were　obtained　in　the　velocitles　of　pressure　drops　and　the　scaled　pressure　drops.