| Issue |
Europhys. Lett.
Volume 48, Number 6, December 1999
|
|
|---|---|---|
| Page(s) | 629 - 633 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i1999-00530-3 | |
| Published online | 01 September 2002 | |
Experimental evidence of chaotic advection in a convective flow
1
Dipartimento di Fisica Generale, Università di Torino, Via P. Giuria 1, 10125 Torino, Italy
2
Istituto Nazionale di Fisica della Materia, Unità di Torino Università - Torino, Italy
3
Dipartimento di Fisica, Università "La Sapienza” - P.le Aldo Moro 2, 00185 Roma, Italy
4
Istituto Nazionale di Fisica della Materia - Unità di Roma I, Roma, Italy
5
Dipartimento di Idraulica Trasporti e Strade, Università "La Sapienza”, Via Eudossiana 18, 00185 Roma, Italy
6
Dipartimento di Ingegneria del Territorio, Università di Cagliari, P.zza d'Armi, 90123, Cagliari, Italy
Received:
4
August
1999
Accepted:
20
October
1999
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 
.
A simple dimensional argument for explaining the observed power
law scaling is proposed.
PACS: 47.27.Te – Convection and heat transfer / 05.45.Tp – Time series analysis / 05.45.Ac – Low-dimensional chaos
© EDP Sciences, 1999
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