Shear viscosity and order parameter dynamics of fluids near the critical point

Journal Article · Tue Oct 01 00:00:00 EDT 1974 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.1682439· OSTI ID:6804000

Oxtoby, D W; Gelbart, W M

Recent theoretical work has indicated that some of the kinetic coefficients may change rapidly near the critical point due to the nonlinear coupling between the hydrodynamic modes. Because one mode (such as a heat mode, viscous mode, or sound wave) can break up into 2 or more other modes, the transport coefficients are enhanced and can in fact diverge at the critical point. The calculation of these coupling constants and the resulting divergences in transport coefficients is now commonly referred to as mode-mode coupling theory. A simple modification is presented of the mode-coupling equations which relate the shear viscosity to the decay rate of order parameter fluctuations of simple fluids and binary mixtures near their critical points. Both the critical shear viscosity and the critical Rayleigh linewidth can be calculated with no adjustable parameters by including the background Rayleigh linewidth in these equations, using only background transport data and static critical properties. These predictions are found to be in good agreement with presently available experimental data. (16 refs.)

• Research Organization: Calif Univ., Berkeley
• OSTI ID: 6804000
• Journal Information: J. Chem. Phys.; (United States), Vol. 61:7
• Country of Publication: United States
• Language: English

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PHYSICAL AND ANALYTICAL CHEMISTRY
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