The Dynamics of Pulse-Laser-Induced Bubble in Liquid Nitrogen.

Abstract

The behavior of bubbles in cryogenic liquids may differ from those in water or other normal temperature liquids, because the subcooled degree and their thermophysical properties are greatly different from normal ones. Experimental reports of laser-induced cryogenic bubbles, however, have been quite insufficient. This paper describes an investigation of the behavior of pulse-laser-induced vapor bubble in liquid nitrogen. The bubble is produced by pulsed irradiation of a ruby laser. The dynamics of laser-induced bubble is visualized by high-speed photography of an image-converter camera. The pressure signals from the bubble motion in the liquid nitrogen have been measured. For comparison with the experimental results, numerical study has also been performed on the dynamics of a single spherical bubble in liquid nitrogen with including the phase change effects.