Abstract
Lagrangian chaos is experimentally investigated in a convective flowby means of Particle Tracking Velocimetry. The Finite SizeLyapunov Exponent analysis is applied to quantify dispersionproperties 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 ℛa1/2. A simple dimensional argument for explaining the observed powerlaw scaling is proposed.
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