An Examination of the Spherical Scatterer Approximation in Aqueous Suspensions of Sand
An Examination of the Spherical Scatterer Approximation in Aqueous Suspensions of Sand
复制标题
沙子水悬浮液中球形散射体近似的检验
DOI：
10.1121/1.396153
复制
发表时间：
1988
影响因子：
2.4
通讯作者：
["J. Sheng
中科院分区：
文献类型：
--
作者：
["J. Sheng
将现有的稀水悬浮液散射声强和衰减数据与理论进行了比较。在理论计算中，散射体被假设为球形和弹性，或刚性和可移动，或刚性和不可移动。刚性可移动模型提供了最佳的拟合数据。与刚性球模型相比，弹性模型的失效表明天然砂粒不会发生共振激励，这可能是由于形状的不规则性。刚体可动模型比刚体不可动模型更符合实验结果，说明粒子的惯性是重要的。基于Johnson [J]引入的所谓高通模型的修正形式，已经构造了形状因子和衰减系数的附加近似表达式。Acoust。Soc。[j].中国科学院学报，2004,27(2)。修改后的高通模型提供了与数据一样好的拟合，甚至优于r…
The available data for scattered acoustic intensity and attenuation in dilute aqueous suspensions of sand are compared with theory. In theoretical calculations, the scatterer is assumed to be spherical and elastic, or rigid and movable, or rigid and immovable. The rigid movable model provides the best fit to the data. The failure of the elastic model in comparison to the rigid sphere models indicates that resonance excitation does not occur in natural sand grains, probably because of irregularities in shape. The fact that better agreement with experiment is obtained with the rigid movable model than with the rigid immovable model indicates that the inertia of the particles is important. Additional approximate expressions for the form factor and attenuation coefficient have been constructed based on a modified form of the so‐called high‐pass model introduced by Johnson [J. Acoust. Soc. Am. 61, 275–277 (1977)]. The modified high‐pass model provides a fit to the data that is as good as, or better than, the r...