超声作用下刚性壁面附近的双气泡脉动

在实际应用时,空化泡可能位于刚性壁附近。对刚性壁附近的空化泡脉动进行研究有利于更好地利用声空化。文章研究了刚性壁附近双气泡的动力学规律。研究结果表明,当两气泡与刚性壁距离相同时,气泡与壁之间的距离越大,刚性壁对辐射声波的反射越小,气泡脉动时能够达到的最大半径与最小半径的比值(即压缩比)也越大。若改变单个气泡与刚性壁的距离,则当两个气泡距离接近时,位置固定的气泡压缩比会减小。增大单个气泡的平衡半径,会使得两气泡脉动时的压缩比变小。此外,文章还对两气泡间距固定情况下,气泡压缩比与两气泡中心连线和壁面所成夹角之间的关系进行了讨论。

Pulsations of double bubbles near a rigid wall under the driving of ultrasound

In real applications of ultrasonic cavitation, the cavitation bubbles perhaps locate at the region around rigid wall. Investigation of bubble pulsation near the wall is beneficial to utilize cavitation. The dynamics of bubbles near rigid wall is studied in this paper. The results reveal that if the distances of two bubbles to the wall are the same, with the increase of the distance, reflection of the rigid wall falls down, and the ratio of the maximum radius to the minimum radius of each bubble in pulsation (i.e. compression ratio) increases; the compression ratio of the bubble with a fixed position decreases when it is approached by another bubble with a varying distance from the wall; Increasing the equilibrium radius of a certain bubble leads to the decrease of the compression ratios of the two bubbles. Moreover, this paper also discusses the relationship of the bubble compression ratio with the angle between the connecting line of two bubble centers and the wall surface when the spacing between the two bubbles is fixed.