Microbubble Oscillation on Localized Heat Source Affected by Dissolved Gases in Water
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914801336188928 |
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| author | Hiroshige, Nao Okai, Shunsuke Zhang, Xuanwei Kumar, Samir Namura, Kyoko Suzuki, Motofumi |
| author_facet | Hiroshige, Nao Okai, Shunsuke Zhang, Xuanwei Kumar, Samir Namura, Kyoko Suzuki, Motofumi |
| contents | Recently, we demonstrated that the local heating of degassed water can generate water vapor microbubbles and induce a rapid flow around the bubble. Although flow generation involves the self-excited oscillation of bubbles at a local heating point, the conditions under which the bubbles oscillate are not fully understood. In this study, the dependence of microbubble size and oscillation frequency on the concentration of non-condensable gas in water was investigated. A continuous-wave laser beam was focused on a $β$-FeSi$_2$ thin film, and water was locally heated using the photothermal conversion properties of the film. The results showed that the lower the concentration of non-condensable gas dissolved in water, the smaller the bubble size and the higher the oscillation frequency. Furthermore, it was found that the bubbles oscillate when the amount of non-condensable gas absorbed by the bubbles, i.e., the bubble size, falls below a specific level. This study can provide a new understanding of the bubble oscillation mechanism and lead to the development of fluid control technology using bubbles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_07530 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Microbubble Oscillation on Localized Heat Source Affected by Dissolved Gases in Water Hiroshige, Nao Okai, Shunsuke Zhang, Xuanwei Kumar, Samir Namura, Kyoko Suzuki, Motofumi Fluid Dynamics Recently, we demonstrated that the local heating of degassed water can generate water vapor microbubbles and induce a rapid flow around the bubble. Although flow generation involves the self-excited oscillation of bubbles at a local heating point, the conditions under which the bubbles oscillate are not fully understood. In this study, the dependence of microbubble size and oscillation frequency on the concentration of non-condensable gas in water was investigated. A continuous-wave laser beam was focused on a $β$-FeSi$_2$ thin film, and water was locally heated using the photothermal conversion properties of the film. The results showed that the lower the concentration of non-condensable gas dissolved in water, the smaller the bubble size and the higher the oscillation frequency. Furthermore, it was found that the bubbles oscillate when the amount of non-condensable gas absorbed by the bubbles, i.e., the bubble size, falls below a specific level. This study can provide a new understanding of the bubble oscillation mechanism and lead to the development of fluid control technology using bubbles. |
| title | Microbubble Oscillation on Localized Heat Source Affected by Dissolved Gases in Water |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2401.07530 |