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Light-scattering measurements of entropy and viscous fluctuations in a liquid far from thermal equilibrium

Physical Review A, ISSN: 1050-2947, Vol: 41, Issue: 2, Page: 816-824
1990
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We have performed small-angle Rayleigh-scattering measurements in toluene subject to a large stationary temperature gradient T. The experiments demonstrate the presence of long-range entropy and viscous fluctuations enhancing and modifying the Rayleigh spectrum. The experiments confirm that the viscous-heat-mode contributions vary with (T)2/q4, where q is the wave number of the fluctuations. The observed amplitudes of both the entropy and viscous fluctuations are in excellent agreement with the theoretical predictions for the fluctuations in nonequilibrium fluids. © 1990 The American Physical Society.

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