高温金属をサブクール水中に急冷した時の特性温度に及ぼす試片形状の影響

概要

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The characteristic temperature during quenching of cylindrical and spherical silver specimens in stiee subcooled water has been investigated to clarify the cause of the scattering and discrepancy of the data which have been reported by many investigators. The following results were obtained, 1) The local premature collapse of vapor blanket at the sharp corner of ends of cylindrical specimen or at the support tube significantly affects the values of characteristic temperature and it's dependence on liquid subcooling. 2) If the hemispherical geometry of both ends of cylinders or spherical geometry were selected to eliminate the local collapse of vapor blanket and if the premature collapse at support tube was prevented, the values of characteristic temperature did not exceed the maximum temperature predicted by the thermodynamic model by LIENHARD and agreed well with the value predicted by the hydrodynamic model by BERENSON regardless of liquid subcooling and specimen geometry. 3) It can therefore be presumed that the scattering and discrepancy of the reported values of characteristic temperature might have arisen from the local premature collapse of the vapor blanket at the corner of the ends of cylindrical specimens or at the support tube.
社団法人日本鉄鋼協会の論文
1989-04-01