高温物体の液中急冷過程に対する超音波照射の影響

概要

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This report presents an active method for augmenting and controlling the rapid cool-down process of high-temperature solids submerged in water. A 40kHz ultrasonic wave, which is supplied from a PZT-type vibrator of 300W electric input, is applied to a cylindrical test piece made of Silver and submerged in subcooled water. The experiments show that the cool-down process is markedly Improved by ultrasonic wave application especially for the condition of large subcooling. The temperature-time curves are divided into four types. The cooling rates during both the film boiling stage and the transition boiling stage are improved. The quench temperature is also improved to a higher side by ultrasonic wave application. The boiling configurations are photographed and compared. The vapor film layer at the film boiling stage is shaken by ultrasonic wave. The effect of ultrasonic wave on the rapid cool-down process is also influenced by the distance from the vibrator to the test piece and is shown to correspond with the profile of sound pressure.
一般社団法人日本機械学会の論文
1990-06-25