Abstract Cavitation damage has been considered as being responsible for many effects in hydraulic machinery and biological medicine. In order to better understand the cavity interaction with nearby solid surfaces, the impact loading induced by the high-speed liquid-jet and subsequent jet flow during the final stage of the bubble collapse in a static fluid is investigated by focusing a Q-switched pulsed laser into water. By means of a new method based on a fibre-coupling optical beam deflection technique, a detailed experimental study has been made to clarify the relationship of the impact pressure against a solid boundary as a function of the dimensionless γ that is generally used to describe the bubble dynamics with its definition $\gamma=s/R_{\max}$ ($R_{\max}$ being the maximum bubble radius and s denoting the distance of the cavity inception from the boundary). The experimental results are shown that for $\gamma$ in the range of about 0.67 to 0.95 with a pulsed laser energy 230mJ, the transient pressure applied on the solid surface is maximum; while for $\gamma>1$ or $\gamma<0.67$, it is gradually decreased. By combination of our experimental results with the other work that detected the acoustic emission during the bubble collapse at different $\gamma$, it is concluded that in this range of 0.67－0.95, the destructive effect due to a liquid-jet and the following jet flow impact actually outweighs the well-known effect of shock wave emission and plays a vital role during the cavitation bubble collapse.
Received: 16 July 2003
Revised: 27 October 2003
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 60208004), the Natural Science Foundation of Jiangsu Province (Grant No BK2001056), the Teaching and Research Award Program for Outstanding Young Professor in Higher Education
Cite this article:
Chen Xiao (陈笑), Xu Rong-Qing (徐荣青), Shen Zhong-Hua (沈中华), Lu Jian (陆建), Ni Xiao-Wu (倪晓武) Experimental investigation of the impact on nearby solid boundary during laser-generated bubble collapse 2004 Chinese Physics 13 505
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
