A MODIFIED KURIHARA MIXING RULE AND A COMPARISON OF DENSITY-INDEPENDENT MIXING RULES

A modified density-independent Kurihara mixing rule is developed by in troducing the low density limit condition into the excess Helmholtz fr ee-energy function at infinite pressure. A parallel comparison of the new mixing rule and existing density-independent mixing rules was perf ormed using the same equation of state and excess function and the sam e experimental data sets. Five existing density-independent mixing rul es were examined: Huron and Vidal (1979), Kurihara et al. (1987), Wong and Sandler (1992) and van der Waals mixing rules with one or two bin ary interaction coefficients. Non-polar, non-polar-polar and polar-pol ar binary and ternary systems have been tested.