Effect of Internal Phenomena on Bubble Motion. 2nd Report. Effects of Transport Phenomena and Mist Formation Inside Bubble at the Expanding Phase.

文男, 竹村; 洋一郎, 松本

doi:10.1299/kikaib.58.2060

Trans.JSME, Ser.B

1992

DOI: 10.1299/kikaib.58.2060

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Effect of Internal Phenomena on Bubble Motion. 2nd Report. Effects of Transport Phenomena and Mist Formation Inside Bubble at the Expanding Phase.

竹村文男¹,

松本洋一郎²

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2011

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Cited by 2 publications

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Medical Application of Fluid Dynamics (Diagnostic and Therapeutic Integrated System by Ultrasound)

洋一郎

2011

Trans.JSME, Ser.B

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Medical applications of ultrasound such as High Intensity Focused Ultrasound, Extracorporeal Lithotripsy and ultrasound contrast agent imaging have recently been the subject of much interest as the medical application of fluid dynamics. In these applications, nonlinear bubble motion facilitates the medical treatment by improving the image quality or enhancing the therapeutic effects through localized heating, erosion or acoustic emission. Utilizing those phenomena, a diagnostic and therapeutic integrated system can be developed. It is essential to understand ultrasound propagating and heating phenomena in a human body, which is inhomogeneous medium, and enhanced local heating phenomena by micro bubbles. In this paper, medical applications of ultrasound with microbubbles, acoustic cavitation and ultrasound propagation in human body are highlighted.

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Medical Application of Fluid Dynamics (Diagnostic and Therapeutic Integrated System by Ultrasound)

洋一郎

2011

Trans.JSME, Ser.B

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Investigation of Brownian Motion of Micro- and Nano-Bubble

Sekiguchi

Kawaguchi²,

Saitō³

et al. 2011

Trans.JSME, Ser.B

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In this paper, nanobubble shrunk from microbubble generated by electrolysis was observed by optical microscope in order to distinguish a bubble from impurities or contamination in the water. To keep microbubbles in focus, it is necessary to generate microbubble whose diameter is less than 5µm in focal position directly since its rising velocity is negligibly small and shrink rapidly. Therefore, diameter distribution of bubble generated by electrolysis was firstly investigated under the different configurations of electrode diameter, concentration of solution and voltage. In the result, when diameter of electrode was less than 1µm, distribution of bubble diameter was decreased to generate smaller bubble. Observation of Brownian motion of nanobubble was succeeded. Root mean square of displacement and diameter of nanobubble were simultaneously measured and compared with a behavior of the ZnO solid particle. As a consequence, root mean square of displacement of bubble is smaller than that of ZnO particle due to different structure of interface.

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Effect of Internal Phenomena on Bubble Motion. 2nd Report. Effects of Transport Phenomena and Mist Formation Inside Bubble at the Expanding Phase.

Cited by 2 publications

References 3 publications

Medical Application of Fluid Dynamics (Diagnostic and Therapeutic Integrated System by Ultrasound)

Medical Application of Fluid Dynamics (Diagnostic and Therapeutic Integrated System by Ultrasound)

Investigation of Brownian Motion of Micro- and Nano-Bubble

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