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Recently, we demonstrated that the local heating of degassed water cangenerate water vapor microbubbles and induce a rapid flow around the bubble.Although flow generation involves the self-excited oscillation of bubbles at alocal heating point, the conditions under which the bubbles oscillate are notfully understood. In this study, the dependence of microbubble size andoscillation frequency on the concentration of non-condensable gas in water wasinvestigated. A continuous-wave laser beam was focused on a $\beta$-FeSi$_2$thin film, and water was locally heated using the photothermal conversionproperties of the film. The results showed that the lower the concentration ofnon-condensable gas dissolved in water, the smaller the bubble size and thehigher the oscillation frequency. Furthermore, it was found that the bubblesoscillate 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 newunderstanding of the bubble oscillation mechanism and lead to the developmentof fluid control technology using bubbles.

Microbubble Oscillation on Localized Heat Source Affected by Dissolved Gases in Water