Experimental evidence of chaotic advection in a convective flow

被引：12

作者：

Boffetta, G

Cencini, M

Espa, S

Querzoli, G

机构：

[1] Univ Turin, Dipartimento Fis Gen, I-10125 Turin, Italy

[2] Univ Turin, Ist Nazl Fis Mat, I-10125 Turin, Italy

[3] Univ Rome La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[4] Univ Rome La Sapienza, Dipartimento Idraul Trasporti & Strade, I-00185 Rome, Italy

[5] Ist Nazl Fis Mat, Unita Roma 1, Rome, Italy

[6] Univ Palermo, Dipartimento Ingn Terr, I-90123 Palermo, Italy

来源：

EUROPHYSICS LETTERS | 1999年 / 48卷 / 06期

关键词：

D O I：

10.1209/epl/i1999-00530-3

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Lagrangian chaos is experimentally investigated in a convective flow by means of Particle Tracking Velocimetry. The Finite Size Lyapunov Exponent analysis is applied to quantify dispersion properties at different scales. In the range of parameters of the experiment, Lagrangian motion is found to be chaotic. Moreover, the Lyapunov exponent depends on the Rayleigh number as Ra-1/2. A simple dimensional argument for explaining the observed power law scaling is proposed.

引用

页码：629 / 633

页数：5

共 9 条

[1] Dispersion of passive tracers in closed basins: Beyond the diffusion coefficient [J].