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Temporal evolution of therm oca vitation bubbles using high speed video camera

机译：使用高速摄像机的热空化气泡的时间演变

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In this work, we present a novel method of cavitation, thermocavitation, induced by CW low power laser radiation in a highly absorbing solution of copper nitrate (CuNO_4) dissolved in deionized water. The high absorption coefficient of the solution (α=135 cm~(-1)) produces an overheated region (～300℃) followed by explosive phase transition and consequently the formation of an expanding vapor bubble, which later collapse very rapidly emitting intense acoustic Shockwaves. We study the dynamic behavior of bubbles formed in contact with solid interface as a function of laser power using high speed video recording with rates of ~10~5 fps. The bubble grows regularly without any significant modification of its half-hemisphere shape, it reaches its maximum radius, but it deforms in the final stage of the collapse, probably due to the bubble adhesion to the surface. We also show that the maximum bubble radius and the shock-wave energy scales are inversely with the beam intensity.
机译：在这项工作中，我们提出了一种新的空化方法，即在溶解于去离子水中的硝酸铜（CuNO_4）的高吸收性溶液中，由连续波低功率激光辐射引起的空化。溶液的高吸收系数（α= 135 cm〜（-1））产生一个过热区域（〜300℃），随后发生爆炸性相变，并形成膨胀的蒸汽泡，随后迅速塌陷并散发出强烈的声波。冲击波。我们使用〜10〜5 fps的高速视频记录，研究了与固体界面接触时形成的气泡的动态行为随激光功率的变化情况。气泡规则地生长，没有对其半半球形状进行任何显着改变，它达到了最大半径，但可能在气泡破裂的最后阶段变形，这可能是由于气泡粘附在表面上造成的。我们还表明，最大气泡半径和冲击波能级与射束强度成反比。

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