Birkin Peter R, Offin Douglas G, Leighton Timothy G
School of Chemistry, University of Southampton, Southampton, UK.
Phys Chem Chem Phys. 2005 Feb 7;7(3):530-7. doi: 10.1039/b416658b.
Cavitation theory is used to predict the acoustic pressure at the boundary of the inertial/non inertial threshold for a range of bubble sizes. The sound field generated from a commonly employed sonoelectrochemical cell is modelled. The model is tested with a calibrated hydrophone far from the transducer to avoid spatial averaging. This allows the model to provide the absolute pressure amplitude as a function of axial distance from the source. An electrochemical technique for detecting both inertial and non-inertial cavitation within the solution is employed. This technique uses a dual microelectrode to map the boundary between the regions where inertial cavitation occurs (associated with surface erosion), and where it does not. This zone occurs close to the transducer for the microelectrode employed (<1.5 mm). Further characterisation of the inertial cavitation zone is achieved by imaging of multibubble sonoluminescence (MBSL). The pressures at the boundary between inertial and non inertial cavitation that are determined from the electrochemical and imaging experiments are compared to a sound field model and cavitation theory. Qualitative arguments for the invasive nature of the electrode into the sound field are proposed. Evidence for cavity cluster collapse and shock wave emission is presented and discussed in relation to luminescence, the electrochemical experiments and cavitation theory.
空化理论用于预测一系列气泡尺寸下惯性/非惯性阈值边界处的声压。对常用的声电化学池产生的声场进行建模。该模型通过远离换能器的校准水听器进行测试，以避免空间平均。这使得该模型能够提供作为距源轴向距离函数的绝对压力幅值。采用一种电化学技术来检测溶液中的惯性空化和非惯性空化。该技术使用双微电极来绘制惯性空化发生区域（与表面侵蚀相关）和未发生惯性空化区域之间的边界。对于所采用的微电极，该区域出现在靠近换能器的位置（<1.5毫米）。通过多泡声致发光（MBSL）成像进一步表征惯性空化区域。将由电化学和成像实验确定的惯性空化与非惯性空化边界处的压力与声场模型和空化理论进行比较。提出了关于电极侵入声场的定性论据。给出了腔簇坍塌和冲击波发射的证据，并结合发光、电化学实验和空化理论进行了讨论。
