Church C C
Department of Biophysics, School of Medicine and Dentistry, University of Rochester, New York 14642.
J Acoust Soc Am. 1988 Nov;84(5):1758-64. doi: 10.1121/1.397192.
A reinterpretation of existing theory for rectified diffusion, the process by which bubbles in a sound field may grow in radius, is presented in order to quantitate the effect of acoustic microstreaming on bubble growth rates. The 1/t term in the growth rate equation is defined as the "decay term" and t as the "decay time," the time required for the gas concentration in the liquid contacting the bubble to rise (or fall) from its initial to its final value. In the absence of microstreaming, t is the duration of sonification. In the presence of microstreaming, t may be calculated from the streaming velocity and the bubble radius. A comparison between theory and the experimental results of Eller [A. Eller, J. Acoust. Soc. Am. 46, 1246-1250 (1969)] and of Gould [R.K. Gould, J. Acoust. Soc. Am. 56, 1740-1746 (1974)] shows reasonable agreement in the low kHz range. Theoretical results in the frequency range of 1-10 MHz at 1 and 4 bar are also presented.
为了量化声微流对气泡生长速率的影响，本文对现有理论进行了重新诠释，该理论用于解释整流扩散，即声场中气泡半径可能增大的过程。生长速率方程中的1/t项被定义为“衰减项”，t被定义为“衰减时间”，即与气泡接触的液体中气体浓度从初始值上升（或下降）到最终值所需的时间。在没有微流的情况下，t是超声处理的持续时间。在存在微流的情况下，t可以根据微流速度和气泡半径来计算。理论与埃勒[A. 埃勒，《美国声学学会杂志》46, 1246 - 1250 (1969)]以及古尔德[R.K. 古尔德，《美国声学学会杂志》56, 1740 - 1746 (1974)]的实验结果之间的比较表明，在低频千赫兹范围内存在合理的一致性。本文还给出了在1巴和4巴压力下1 - 10兆赫兹频率范围内的理论结果。
