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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Contribution of the acoustic-wake effect to the attenuation of sound in dilute suspensions of rigid particles
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Contribution of the acoustic-wake effect to the attenuation of sound in dilute suspensions of rigid particles

机译：硬质颗粒稀悬液中声唤醒效应对声音衰减的贡献

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摘要

This work deals with the attenuation of sound in dilute suspensions of rigid particles when the hydrodynamic mechanism of the acoustic-wake effect is considered. The study extends a previous model by considering asymmetric flow-field conditions around the particles, caused by other neighbor particles along the direction of propagation of the acoustic field. The attenuation coefficient is derived from the force equation for a spherical particle in an incompressible fluid that is oscillating at low frequencies and amplitudes within the range of Reynolds numbers of 0.1>Re>1. It acquires higher values than those obtained for the Stokes regime (Re/spl Lt/1), increasing up to about 8% at Reynolds numbers close to the unity. In the study we found the particle size as a significant parameter on the sound attenuation, together with concentration of particles.
机译：当考虑到声唤醒效应的流体力学机理时，这项工作处理了在刚性颗粒的稀悬浮液中的声音衰减。该研究通过考虑粒子周围非对称流场条件（由其他相邻粒子沿声场传播方向引起的流动）来扩展先前的模型。衰减系数是从不可压缩流体中的球形粒子的力方程得出的，该力方程在0.1雷诺数（Reynolds number）> Re> 1（雷诺数）的范围内以低频和振幅振荡。它获得的值高于斯托克斯政权获得的值（Re / spl Lt / 1），在雷诺数接近于一的情况下增加了约8％。在研究中，我们发现颗粒大小和颗粒浓度是影响声衰减的重要参数。

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