The mechanical disturbance created by an ultrasonic wave travelling through a liquid medium induces the formation of cavitation that oscillates due to rarefaction and compression of the wave. The duration and the magnitude of the pressure applied by the ultrasonic wave at each instant would generate a specific impact on the variation of the bubble radius, the temperature, the pressure and the mass inside it. In this paper, a numerical study is conducted to simulate four waveforms (sinusoidal, square, triangular and sawtooth) travelling an aqueous media saturated with oxygen with an amplitude of 1.5 and 2 atm and a frequency of 200, 300 and 500 kHz. The purpose is to highlight the mass evolution within acoustic cavitation bubble during one cycle due to physical transformations and sonochemical effect. The obtained results demonstrated that square signal enhances temperature and pressure growth inside the bubble, as well as mass transfer by evaporation and condensation. This leads to an improvement of produced quantities of free radicals but also to a selectivity of O as a major product in the detriment of HO₂^● and ^●OH. These trends are less and less observed when passing to sinusoidal, triangular and square signal.

由超声波传播通过液体介质而产生的机械干扰会导致形成空化现象，该空化现象是由于波的稀疏性和压缩而振荡的。超声波在每个瞬间施加的压力的持续时间和大小都会对气泡半径，温度，压力及其内部质量的变化产生特定的影响。在本文中，进行了数值研究，以模拟四个波形（正弦波，方波，三角波和锯齿波），这些波形在振幅为1.5和2 atm，频率为200、300和500 kHz的氧饱和的水介质中传播。目的是强调由于物理转变和声化学效应，在一个周期内声空化气泡内的质量演化。获得的结果表明，方形信号增强了气泡内部的温度和压力的增长，以及通过蒸发和冷凝产生的质量传递。这不仅提高了自由基的产生量，还提高了作为主要产物的O的选择性，不利于HO的生成。₂ ^●和^● OH。当传递到正弦，三角形和正方形信号时，这些趋势越来越少被观察到。