Ternary liquid mixture thermal conductivities
Chemical Engineering Science, 43 (2):
361--371 (1988)DOI: 10.1016/0009-2509(88)85049-8
Abstract
A paucity of multicomponent liquid mixture thermal conductivities has left untested those thermal conductivity predictive models which are amenable to multicomponent mixtures. A transient hot-wire thermal conductivity cell was constructed, calibrated and used to measure ternary liquid mixture thermal conductivities over the entire composition range at 25°C and ambient pressure. These data were used to evaluate existing models which do not contain adjustable parameters. The Li model was found to be inadequate while the power-law model was found to be surprisingly accurate for nonaqueous systems, but it requires an adjustable parameter if water is one of the components. The local-composition model was found to agree well with the experiments without the above restriction. However, the agreement was even better if a new mixing rule is used, but the old rule should be retained for systems containing water. Ternary effects are unimportant and the local-composition model can be used for multi-component systems. Attempts to predict vapor-liquid equilibria from local compositions fitted from thermal conductivity data were unsuccessful.