Number density of bubbles under ultrasonic horn measured from stroboscopic images
Number density of bubbles under ultrasonic horn measured from stroboscopic images
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DOI：
10.35848/1347-4065/abe99c
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发表时间：
2021-02
影响因子：
1.5
通讯作者：
Takanobu Kuroyama
中科院分区：
文献类型：
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作者：
Takanobu Kuroyama
虽然在声空化气泡的分析中图像测量是必不可少的，但不可能从图像中确定气泡沿成像系统光轴的位置。因此，气泡的数量密度不能从图像中测量出来。本文提出了一种利用气泡图像亮度确定气泡沿光轴位置的方法。利用单泡系统中的气泡，阐明了气泡沿光轴位置、气泡直径与气泡图像亮度之间的关系。在此基础上建立了气泡数密度的测量方法。利用该方法，揭示了超声喇叭下气泡数密度的时均空间分布。
Although image measurement is essential in the analysis of acoustic cavitation bubbles, it is impossible to determine the position of the bubble along the optical axis of the imaging system from the images. Thus, the number density of the bubbles cannot be measured from the image. This paper proposed a method to determine bubbles’ positions along the optical axis using the bubble image brightness. The relationship among the bubble position along the optical axis, the bubble diameter, and the bubble image brightness is clarified using the bubble in the single bubble system. A measurement method of the bubble number density based on this relationship is established. Using this method, the time-averaged spatial distribution of bubble number density under ultrasonic horn is revealed.