Shape-dependence of particle rotation in isotropic turbulence

被引：93

作者：

Byron, M. ^{[1
,2
]}

Einarsson, J. ^{[2
,3
]}

Gustavsson, K. ^{[2
,3
]}

Voth, G. ^{[2
,4
]}

Mehlig, B. ^{[2
,3
]}

Variano, E. ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Civil & Environm Engn, Berkeley, CA 94720 USA

[2] NORDITA, S-11421 Stockholm, Sweden

[3] Gothenburg Univ, Dept Phys, S-41296 Gothenburg, Sweden

[4] Wesleyan Univ, Dept Phys, Middletown, CT 06459 USA

来源：

PHYSICS OF FLUIDS | 2015年 / 27卷 / 03期

基金：

美国国家科学基金会;

关键词：

ELLIPSOIDAL PARTICLES; ALIGNMENT; DYNAMICS; ORIENTATION; VORTICITY; GRADIENT; MOTION;

D O I：

10.1063/1.4913501

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

We consider the rotation of neutrally buoyant axisymmetric particles suspended in isotropic turbulence. Using laboratory experiments as well as numerical and analytical calculations, we explore how particle rotation depends upon particle shape. We find that shape strongly affects orientational trajectories, but that it has negligible effect on the variance of the particle angular velocity. Previous work has shown that shape significantly affects the variance of the tumbling rate of axisymmetric particles. It follows that shape affects the spinning rate in away that is, on average, complementary to the shape-dependence of the tumbling rate. We confirm this relationship using direct numerical simulations, showing how tumbling rate and spinning rate variances show complementary trends for rod-shaped and disk-shaped particles. We also consider a random but non-turbulent flow. This allows us to explore which of the features observed for rotation in turbulent flow are due to the effects of particle alignment in vortex tubes. (C) 2015 AIP Publishing LLC.

引用

页数：15

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