Fluctuations in inhomogeneous and nonequilibrium fluids under the influence of gravity

P.N. Segrè, R. Schmitz and J.V. Sengers

Physica A: Statistical Mechanics and its Applications, 1993, vol. 195, issue 1, 31-52

Abstract: An analysis is presented of the Rayleigh component of the dynamic structure factor of a fluid under the influence of gravity and of a stationary temperature gradient. A conservative force like gravity in the absence of a temperature gradient modifies the Rayleigh spectrum, but not the integrated intensity. A dissipative thermodynamic force, like a temperature gradient, yields a modification of the Rayleigh spectrum and an enhancement of the Rayleigh-line intensity which varies as k-4 with the wave number k of the fluctuations. In the presence of both gravity and a temperature gradient, this k-4 growth law of the nonequilibrium fluctuations saturates for very small wave numbers.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:195:y:1993:i:1:p:31-52

DOI: 10.1016/0378-4371(93)90252-Y

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