Pressure measurement with shock wave, and liquid jet visualization of a cavitation bubble collapsing near the hard surface.

Cavitation is a well known phenomenon that occurs in the liquid when subjected to low pressure causing significant damages to the engineering systems. And, thereby affecting the system performances drastically. Many factors lead to this destruction, and out of those, two of the important elements under investigation are the generation of shock waves, and the formation of liquid jet at the end of the collapse of the cavitation bubble near the structure. This produces significant pressure on the surface of the wall leading to its damages. Many studies have been published in the literature on these aspects. But, there is still an unfamiliarity in the literature describing which of these two factors causing the dominant effect for the damage. In this study, we aim to achieve two goals to disclose this information. Firstly, we measured the pressure produced on the wall due to the impact of the bubble collapsing near to it. Then, we visualized the shock emission by using the Schlieren technique. Finally, we put together both the shock wave visualization, and the pressure measurement on the wall to clearly segregate the pressure produced by the propagating shock, and the liquid jet impact.