Single Bubble Behavior Induced by Nd:YAG Laser Focusing Near Solid Wall in Liquid Nitrogen

抄録

This paper deals with an experimental investigation and visualization on the dynamics of laser induced single bubble in liquid nitrogen near an aluminum wall in cryostat. The cryogenic liquid nitrogen has the characteristic feature of the low latent heat, surface tension, and viscosity, as compared with the normal temperature water. Cavitation phenomena in cryogenic liquid may be different from the phenomena in water at normal temperature. However, there have been only a few reports on the single bubble dynamics combined with laser beam irradiation in cryogenic liquid. In this experiment the plasma is produced by focusing of Nd:YAG laser beam of second harmonics in liquid nitrogen. Laser induced bubble dynamics and interaction with the solid wall have been studied by flow visualization. This paper also shows the comparison between the dynamics of laser-induced single bubble in liquid nitrogen and in distilled water. We have clarified that the behavior of laser induced bubble in liquid nitrogen is different from that in distilled water at normal temperature.