超音波による飽和プール核沸騰熱伝達促進

概要

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The effect of ultrasonic vibrations on a saturated-pool nucleate-boiling heat transfer in the presence and absence of glass beads in distilled water as the working fluid is investigated under reduced pressure. Ultrasonic energy of 140 W with a frequency of 20 kHz expose the flat heated surface of 20 mm in diameter, which is immersed in the saturated working fluid. The heat-transfer coefficient with glass beads in distilled water is larger than that without glass beads, and up to a four fold increase in the heat-transfer coefficient is obtained in this experimental condition. The heat-transfer coefficient increases with the decrease of system pressure, but it decreases with the increase of heat flux. Observation by 35 mm photographs elicits some considerations on the mechanism.
一般社団法人日本機械学会の論文
1990-04-25