INSERM U930 CNRS ERL3106, Université François Rabelais, CHU Bretonneau, 2 Boulevard Tonnellé, 37044 Tours Cedex 9, France.
J Acoust Soc Am. 2011 Feb;129(2):616-21. doi: 10.1121/1.3531839.
A theory is developed that allows one to consider the dynamics of an acoustically induced bubble near a fluid layer of finite density and thickness. The theory reveals that, as far as the scattered field of a bubble in the far-field zone is concerned, the layer thickness is a very important factor because the behavior of the scattered field in the cases of infinite and finite layers is qualitatively different even if both layers are of the same density. The amplitude of the scattered pressure from a bubble pulsating in the vicinity of an infinite layer is larger than that for the same bubble in an unbounded fluid, while in the case of a finite layer, on the contrary, the amplitude of the scattered pressure for a bubble near the layer is smaller than that in an unbounded fluid. It is also shown that the higher the layer density, the greater the difference between the scattered pressure amplitudes for infinite and finite layers.
提出了一种理论，允许人们考虑有限密度和厚度的流体层附近声致气泡的动力学。该理论表明，就远场区域中气泡的散射场而言，层厚度是一个非常重要的因素，因为即使两层的密度相同，无限层和有限层的散射场行为也有很大的不同。在无限层附近脉动的气泡的散射压力的幅度大于在无界流体中的相同气泡的幅度，而在有限层的情况下，相反，在靠近层的气泡的散射压力的幅度小于在无界流体中的幅度。还表明，层密度越高，无限层和有限层的散射压力幅度之间的差异就越大。
