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Numerical Investigation of the Influences of Liquid Viscosity, Surface Tension and Initial Bubble Gas Content on the Dynamic Properties of a Laser-Induced Cavitation Bubble
B. Han, B.Yang, Z-H. Shen, J. Lu and X-W. Ni

The influences of the liquid viscosity, surface tension and initial bubble gas content on the dynamic properties of a laser-induced cavitation bubble are investigated numerically by means of the finite difference method. The bubble model used in the simulation is improved by taking into consideration the thermodynamic characteristics of the substance inside the bubble. The validity of this improvement is proved by experimental and numerical investigations. The increase in the viscosity-induced retardance slows down when the viscosity becomes high. The viscosity-induced attenuation in the bubble energy weakens as the bubble shrinks. Surface tension is a resistance in the expansion stage of a bubble, although its influence on the bubble dynamics is weak. The increase in the initial gas content leads to an enhancement in the compression of the bubble.

Keywords: laser, viscosity, surface tension, initial gas content, bubble dynamics, cavitation

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