Gravity effects on Soret-induced non-equilibrium fluctuations in ternary mixtures
Martínez Pancorbo, P; Ortiz de Zárate, JM; Bataller, H; et al.Croccolo, F
Date: 1 February 2017
Journal
The European Physical Journal E
Publisher
EDP Sciences
Publisher DOI
Abstract
We discuss the gravity effects on the dynamics of composition fluctuations in a ternary mixture
around the non-equilibrium quiescent state induced by thermodiffusion when subjected to a stationary temperature
gradient. We found that the autocorrelation matrix of concentration fluctuations can be expressed
as the sum of two exponentially ...
We discuss the gravity effects on the dynamics of composition fluctuations in a ternary mixture
around the non-equilibrium quiescent state induced by thermodiffusion when subjected to a stationary temperature
gradient. We found that the autocorrelation matrix of concentration fluctuations can be expressed
as the sum of two exponentially decaying concentration modes. Without accounting for confinement, we
obtained exact analytical expressions for the two decay rates which, as a consequence of gravity, display
a wave-number-dependent mixing. The stability of the quiescent solution is also examined, as a function
of the two solutal Rayleigh numbers used to express the decay rates. After having discussed the dynamics
of the two concentration modes, we calculate the corresponding amplitudes. Consequences for optical
experiments are discussed.
Physics and Astronomy
Faculty of Environment, Science and Economy
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