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de Zárate J.M.O., Sengers J.V. — On the Physical Origin of Long-Ranged Fluctuations in Fluids in Thermal Nonequilibrium States
de Zárate J.M.O., Sengers J.V. — On the Physical Origin of Long-Ranged Fluctuations in Fluids in Thermal Nonequilibrium States

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Название: On the Physical Origin of Long-Ranged Fluctuations in Fluids in Thermal Nonequilibrium States

Авторы: de Zárate J.M.O., Sengers J.V.

Аннотация:

Journal of Statistical Physics, Vol. 115, Nos. 5/6, June 2004. p. 1341-1359.
Thermodynamic fluctuations in systems that are in nonequilibrium steady states are always spatially long ranged, in contrast to fluctuations in thermodynamic equilibrium. In the present paper we consider a fluid subjected to a stationary temperature gradient. Two different physical mechanisms have been identified by which the temperature gradient causes long-ranged fluctuations. One cause is the presence of couplings between fluctuating fields. Secondly, spatial variation of the strength of random forces, resulting from the local version of the fluctuation-dissipation theorem, has also been shown to generate long-ranged fluctuations. We evaluate the contributions to the long-ranged temperature fluctuations due to both mechanisms. While the inhomogeneously correlated Langevin noise does lead to long-ranged fluctuations, in practice, they turn out to be negligible as compared to nonequilibrium temperature fluctuations resulting from the coupling between temperature and velocity fluctuations.


Язык: en

Рубрика: Физика/

Тип: Статья

Статус предметного указателя: Неизвестно

ed2k: ed2k stats

Год издания: 2004

Количество страниц: 19

Добавлена в каталог: 27.10.2013

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