The extension of the significant structure theory of viscosity to the calculation of the viscosities of some selected liquid hydrocarbons such asnhyphen;C12, nhyphen;C15, andnhyphen;C18, etc., has been made. In this derivation, the explicit functional expressions of the molar solidlike volumeVsand the intermolecular potentialphgr;lpar;arpar;were introduced. The agreement between theory and experiment over a wide temperature (35ndash;135deg;C) and pressure range (1ndash;3600 bars) is quite satisfactory. The advantage of this treatment is that thermodynamic as well as transport properties are calculated from this same model of the liquid state.
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