Abstract
To clarify a relationship between non-condensable gases and generation of residual microbubble after the collapse of a single bubble generated by laser or spark, the single bubble dynamics and concentration of the dissolved hydrogen gas were analyzed in ultrapure water. The projected cross-sectional area of the residual microbubbles per potential energy of the bubble was 0.86 mm2 J-1 in the laser case and 3.5 mm2 J-1 in the spark case. The dissolved H2 concentrations per pulse were 0.23 µgL-1J-1 in case of the laser and 0.69 µgL-1J-1 in case of the spark. The amount of the generated residual microbubbles showed a strong relationship with the dissolved H2 concentration. It is possible to conclude that part of the non-condensable gases such as hydrogen generated by the laser and spark form residual microbubbles.
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