Effect of Temperature on the Behaviour of a Laser-Induced Cavitation Bubble Near a Rigid Boundary
X-M. Liu, X-H. Liu, Y-F. Hou, J. He, J. Lu and X-W. Ni
Cavitation bubble dynamics in water at different temperatures were investigated both experimentally and numerically to obtain a better understanding of the physical mechanisms involved in industrial applications. Cavitation bubble tests were performed using water at temperature ranged from freezing point to near boiling. The variation of bubble radii and the oscillation times with temperature were investigated experimentally by means of a fiber-coupled optical beam deflection (OBD) technique. The increases in temperature led to a significant increase of the maximum size of the cavitation bubble and its oscillation period, and the mechanism behind it has also been discussed. Numerical simulations were performed using a modified Rayleigh-Plesset equation includes the viscosity, surface tension and temperature of water. Numerical and experimental results all indicated that the reason for temperature influence on the bubble dynamics were the physical properties such as viscosity, surface tension and the vapour pressure of high temperature water are quite different from those of normal-temperature water.
Keywords: Laser-induced bubble, cavitation bubble, numerical simulation, liquid temperature, optical beam deflection (OBD), bubble radius, bubble lifetime