4枚の振動子を用いた音響流ジェットの発生位置の制御方法(<小特集>音響利用技術-音響情報・音響エネルギー-)

概要

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By applying ultrasonic vibration, the coefficient of heat transfer on the pyrogen surface in a liquid increases remarkably. This depends on the agitating effect of cavitations and acoustic streaming. Heat transfer enhancement by cavitations is influenced by the bubble nuclei that randomly exist in the water. In this study, the method for controlling the position of the jet by acoustic streaming is proposed. Changing the phase of the applied voltage on the four sheets of ultrasonic vibrators can control the peak position of radiation force. It is shown by the theory that the position of streaming tends to avoid the surface of ultrasonic vibrator the phase of which is later than others. The positioning control on plane normal to the flow direction is possible by using this tendency. And experimental results coincide with the theoretical predictions.
社団法人日本機械学会の論文
2001-05-25