Key words: statistical physics, non-equilibrium theory, non-ideal systems, critical phenomena, local fluctuations, supercritical fluids
Exact analytical expressions for large-scale finite local fluctuations in hydrodynamic velocity and temperature of dense non-ideal fluid are obtained. Two simple models are proposed for probability distribution of density and temperature finite fluctuations. It is shown that the fluctuating fluid can be considered as two random fractions, one being more rarefied and the other being more dense than the averaged fluid. The distinctive features of these random fractions make them play different roles in physical and chemical behavior of the fluid. It is stated that large-scale finite local fluctuations are common for wide range of fluid states, not only for the neighborhood of gas— liquid critical point.
doi:10.1134/S1990793112070020