Inertial clustering of particles in high-Reynolds-number turbulence.
Inertial clustering of particles in high-Reynolds-number turbulence.
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DOI：
10.1103/physrevlett.100.214501
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发表时间：
2008-05
影响因子：
8.6
通讯作者：
E. Saw;R. Shaw;S. Ayyalasomayajula;P. Chuang;Á. Gylfason
中科院分区：
文献类型：
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作者：
E. Saw;R. Shaw;S. Ayyalasomayajula;P. Chuang;Á. Gylfason
我们报告了高雷诺数下均匀、各向同性湍流中致密粒子空间聚集的实验证据。随着斯托克斯数的增加，耗散尺度的聚类变得更强，并且在一系列实验条件下（颗粒直径和湍流能量耗散率），与液滴斯托克斯数表现出相似性。这些发现与最近关于湍流中惯性粒子聚类的理论和计算研究在定性上一致。由于雷诺数大，湍流混合引起的颗粒聚类存在较宽的标度范围，并且可以明显地将惯性聚类与流体颗粒混合引起的颗粒聚类区分开来。
We report experimental evidence of spatial clustering of dense particles in homogenous, isotropic turbulence at high Reynolds numbers. The dissipation-scale clustering becomes stronger as the Stokes number increases and is found to exhibit similarity with respect to the droplet Stokes number over a range of experimental conditions (particle diameter and turbulent energy dissipation rate). These findings are in qualitative agreement with recent theoretical and computational studies of inertial particle clustering in turbulence. Because of the large Reynolds numbers a broad scaling range of particle clustering due to turbulent mixing is present, and the inertial clustering can clearly be distinguished from that due to mixing of fluid particles.