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- W992934795 abstract "This chapter discusses thermal nonequilibrium fluctuations in fluid mixtures. A stationary temperature gradient in a liquid mixture induces a stationary concentration gradient through the Soret effect. In the case of a binary mixture, a Boussinesq approximation for a one-component fluid, is usually introduced. The Boussinesq approximation for a mixture implies that one does not incorporate any dependence of the density on pressure, but only its dependence on the temperature and on the concentration. The stability of the conductive solution depends on whether the temperature and concentration gradients are stabilizing. Stability will depend on the sign of the Rayleigh number Ra and on the sign of the separation ratio. The expressions for the dynamic structure factor are reviewed without including any gravity effects. It is found that the nonequilibrium contribution to the dynamic structure factor consists of three independent Lorentzian components associated with viscous, temperature, and concentration fluctuations. The nonequilibrium fluctuations in isothermal free-diffusion processes are also elaborated." @default.
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- W992934795 date "2006-01-01" @default.
- W992934795 modified "2023-09-30" @default.
- W992934795 title "Thermal nonequilibrium fluctuations in fluid mixtures" @default.
- W992934795 doi "https://doi.org/10.1016/b978-044451515-5/50005-3" @default.
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