In this study, the ultrasonic pitting of microscopic particles is investigated using ultrasound with frequencies from 26 kHz to 3.6 MHz. With increasing ultrasonic frequency, the number of pits formed on the surfaces of the microscopic particles increases initially but then decreases, and these changes in the number of pits are attributed to the relationship between the cavitation bubbles and the size of the object, and to the stress generated. Also confirmed is that adding a surfactant affects the ultrasonic pitting, with that effect differing with the surfactant concentration and the ultrasonic frequency. The results suggest that the number of pits depends on the size distribution of the cavitation bubbles and the distance between the bubble and the object. Overall, it is concluded that the important parameters in ultrasonic pitting are (i) the size relationship between the cavitation bubble and the object, (ii) the physical characteristics of the object, and (iii) the distance between the bubble and the object.

在这项研究中，使用频率从 26 kHz 到 3.6 MHz 的超声波研究了微观颗粒的超声波点蚀。随着超声频率的增加，在微观粒子表面形成的凹坑数量先增加后减少，这些凹坑数量的变化归因于空化气泡与物体尺寸之间的关系，以及产生的压力。还证实添加表面活性剂会影响超声点蚀，其影响随表面活性剂浓度和超声频率而不同。结果表明，凹坑的数量取决于空化气泡的尺寸分布以及气泡与物体之间的距离。全面的，