Effects of the dissolved gases in water on microbubble oscillation under photothermal heating

Nao Hiroshige; Shunsuke Okai; Kyoko Namura; Motofumi Suzuki

doi:10.1117/12.2545293

2 March 2020 Effects of the dissolved gases in water on microbubble oscillation under photothermal heating

Nao Hiroshige, Shunsuke Okai, Kyoko Namura, Motofumi Suzuki

Proceedings Volume 11268, Laser-based Micro- and Nanoprocessing XIV; 1126807 (2020) https://doi.org/10.1117/12.2545293
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

Efficient cooling systems are urgently needed because of increasing power density of electronic devices per one semiconductor chip as high as hundreds of W/cm². Recently, we demonstrated that degassing water leads to generation of a water vapor microbubble and subsequent rapid flow under localized heating. In addition, the bubble was found to oscillate at several hundred kHz. In this study, we investigate the dependence of the size and oscillation frequency of the microbubble on the concentration of incompressible gas dissolved in water by focusing a CW laser on the β-FeSi₂ thin film. We found that lower concentration of incompressible gas dissolved in water leaded to smaller size and higher oscillation frequency of a bubble. Furthermore, bubble whose radius is larger than 7.5 μm showed no oscillation in our system. Our work gives a new understanding about the bubble oscillation mechanism and will develop the technique for a novel cooling system using microfluidics.

Citation Download Citation

Nao Hiroshige, Shunsuke Okai, Kyoko Namura, and Motofumi Suzuki "Effects of the dissolved gases in water on microbubble oscillation under photothermal heating", Proc. SPIE 11268, Laser-based Micro- and Nanoprocessing XIV, 1126807 (2 March 2020); https://doi.org/10.1117/12.2545293

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