Study of the interaction between a cavitation bubble and nearby biomimetic gas-entrapping microtextured surfaces and the potential damage effects on the wall using the compressible multiphases volume of fluid model

Abstract

In the study, a compressible multiphase volume of fluid considering the phase change and thermal effect is presented, the interaction between a cavitation bubble and nearby biomimetic gas-entrapping microtextured surfaces is investigated using this model, and the potential damage effects on the wall are carefully analyzed. Based on this interaction, the standoff distance is classified into three types. For γ > 2.0, the cavitation bubble remains spherical during the expansion phase because it is not influenced by the entrapped gas cavities. However, during the contraction phase, it generates a jet directed away from the wall. For 1.0 < γ < 2.0, the cavitation bubble is affected by the cavities, causing it to lose its spherical shape during the expansion phase. For 0 < γ < 1.0, the cavitation bubble is close to the gas cavities, mixing with the gas cavities during the expansion phase. Two processes are identified as the main reasons for the potential damage to the wall. Furthermore, compared to a flat wall surface, the peak of the pressure impulse on the wall with entrapping gas cavities decreases by 33%, and the peak of the heat transfer quantity decreases by 59%, significantly reducing the damage to the wall.