Nagy Dániel, Hegedűs Ferenc
Budapest University of Technology and Economics, Faculty of Mechanical Engineering, Department of Hydrodynamic Systems, Muegyetem rakpart 3, Budapest, 1111, Hungary.
Ultrason Sonochem. 2025 Jul;118:107349. doi: 10.1016/j.ultsonch.2025.107349. Epub 2025 Apr 26.
This study numerically explores the suppression of bubble jet formation in oscillating microbubble pairs under excitation with an ultrasonic pulse, focusing on the conditions that lead to bubble collapse without jetting. Bubble jets (i.e., liquid jets penetrating the bubble) are typically observed in collapsing bubble pairs. However, jet formation can be avoided when the distance between the bubbles is kept within a specific range. We investigate identical-sized bubble pairs aligned along an axis and subjected to a single-cycle ultrasound pulse. Simulations are conducted using the axisymmetric assumption with the ALPACA compressible multiphase flow solver. Our findings revealed that the domain where jet formation is suppressed becomes smaller as the bubble compression increases. This is demonstrated by decreasing the bubble size and the excitation frequency, which allows for greater bubble growth. These results indicate that while jet suppression is feasible for bubble pairs with high compression ratios, it becomes increasingly sensitive to distance.
本研究通过数值模拟探讨了在超声脉冲激发下振荡微气泡对中气泡射流形成的抑制情况，重点关注导致气泡坍塌而无射流的条件。气泡射流（即穿透气泡的液体射流）通常在坍塌的气泡对中观察到。然而，当气泡之间的距离保持在特定范围内时，可以避免射流的形成。我们研究了沿轴排列并受到单周期超声脉冲作用的相同尺寸气泡对。使用轴对称假设和ALPACA可压缩多相流求解器进行模拟。我们的研究结果表明，随着气泡压缩的增加，抑制射流形成的区域会变小。这通过减小气泡尺寸和激发频率得到证明，这使得气泡能够有更大的生长。这些结果表明，虽然对于具有高压缩比的气泡对抑制射流是可行的，但它对距离变得越来越敏感。
