Velocity fluctuations in fluidized suspensions probed by ultrasonic correlation spectroscopy
Velocity fluctuations in fluidized suspensions probed by ultrasonic correlation spectroscopy
复制标题
通过超声相关光谱探测流化悬浮液中的速度波动
DOI：
10.1103/physrevlett.85.453
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发表时间：
2000
影响因子：
8.6
通讯作者：
Weitz
中科院分区：
文献类型：
--
作者：
Cowan;Page;Weitz
使用两种新的超声相关光谱研究了颗粒流化悬浮液中的速度波动：扩散声波光谱和动态声散射。这些技术探测粒子的局部应变率和均方根速度，提供有关速度相关性的空间范围的重要信息。我们的结果证明了这些技术探测流化悬浮液颗粒动力学的能力，并表明速度相关性基本上与 Re(p)<1 的雷诺数无关。
Velocity fluctuations in a fluidized suspension of particles are investigated using two new ultrasonic correlation spectroscopies: diffusing acoustic wave spectroscopy and dynamic sound scattering. These techniques probe both the local strain rate and rms velocity of the particles, providing important information about the spatial extent of velocity correlations. Our results demonstrate the power of these techniques to probe particle dynamics of fluidized suspensions, and suggest that the velocity correlations are essentially independent of Reynolds numbers for Re(p)<1.