集束超音波と液面の干渉による微細液滴の生成

When the focused ultrasound of sufficient acoustic intensity in liquid interacts an air-liquid interface, atomization of the liquid occurs. This atomization process is well known that droplets are generated from the apexes of standing capillary waves with a wavelength that can be related to ultrason...

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Veröffentlicht in:	Japanese journal of multiphase flow 2018/03/15, Vol.32(1), pp.59-64
Hauptverfasser:	世古, 和也, 小林, 一道, 藤井, 宏之, 渡部, 正夫
Format:	Artikel
Sprache:	jpn
Schlagworte:	Apexes Atomizing Bubbles Capillary waves Cavitation Droplets Fine droplets Focused ultrasound High speed photography Microbubble Photography Ultrasonic imaging
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creator	世古, 和也小林, 一道藤井, 宏之渡部, 正夫
description	When the focused ultrasound of sufficient acoustic intensity in liquid interacts an air-liquid interface, atomization of the liquid occurs. This atomization process is well known that droplets are generated from the apexes of standing capillary waves with a wavelength that can be related to ultrasonic frequencies. In addition, there is a hypothesis that cavitation bubble oscillations can play a significant role in the pinch-off of droplets from capillary wave. The aim of this study is to clarify the influence of bubbles on the atomization of liquid. In this paper, we used the focused ultrasound with a frequency of 1 MHz; then, we observed the atomization process by using a high-speed photography. Also, we added the microbubbles to enhance the atomization of liquid. We found that threshold acoustic intensity of generating fine droplets becomes smaller. This result indicates that bubbles contribute significantly to the atomization of the liquid.
doi_str_mv	10.3811/jjmf.32.59
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subjects	Apexes Atomizing Bubbles Capillary waves Cavitation Droplets Fine droplets Focused ultrasound High speed photography Microbubble Photography Ultrasonic imaging
title	集束超音波と液面の干渉による微細液滴の生成
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