A model for hindered rotation at high densities is based on a simple harmonic oscillator theory. The expression for the Hamiltonian so obtained, substituted into the time correlation function expressions for the transport coefficients, gives rise to a more general principle of corresponding states. The reduced equations contain a rotational coupling coefficient which acts as a third parameter; however, only two independent variables are needed in the correlation. For monatomic fluids, or in the low density limit, these equations reduce correctly to the simple two-parameter correspondence principle. The proposed relationships give good agreement for viscosities, thermal conductivities, and self-diffusion coefficients of the 25 fluids tested over a wide range of temperatures and pressures. The model accounts in a reasonable way for thermodynamic properties of polyatomic fluids.
intermolecular attractive forces exceed the thermal and surface forces, which tend to prevent clustering, irreversible formation of a new phase occurs. If this approach is valid, it would permit an estimation of the T N without performing the usual droplet experiment of Turnbull and Cormia (15).The temperature corresponding to an infinite viscosity, T N ,
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