Mode-coupling theory of the stress-tensor autocorrelation function of a dense binary fluid mixture

Supurna Sinha, M. Cristina Marchetti

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We present a generalized mode-coupling theory for a dense binary fluid mixture. The theory is used to calculate molecular-scale renormalizations to the stress-tensor autocorrelation function (STAF) and to the long-wavelength zero-frequency shear viscosity. As in the case of a dense simple fluid, we find that the STAF appears to decay as t-3/2 over an intermediate range of time. The coefficient of this long-time tail is more than two orders of magnitude larger than that obtained from conventional mode-coupling theory. Our study focuses on the effect of compositional disorder on the decay of the STAF in a dense mixture.

Original languageEnglish (US)
Pages (from-to)4942-4953
Number of pages12
JournalPhysical Review A
Issue number8
StatePublished - Jan 1 1992


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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