The thermophysical properties of binary mixtures of molten alkali fluoride salts. Part II: Correlations for the transport properties in reduced form

• The transport properties of molten LiF, NaF, and KF were modeled.
• Properties considered were viscosity, surface tension, and thermal conductivity.
• Parameters of correlations were determined by regression to data.
• Correlations were then modified to work on binary mixtures of these salts.

Correlations for predicting the transport properties of molten salts and their binary mixtures are presented as functions of temperature. The molten salt mixtures considered contained lithium fluoride (LiF), sodium fluoride (NaF), and potassium fluoride (KF). The properties and temperature were reduced using potential parameters. Mixing rules were used to determine these parameters for the mixtures. Certain parameters for the correlations were determined for each property by non-linear regression between experimental data and values calculated from the correlations. The correlations are valid in the liquid phase for temperatures ranging from 765 K to about 1280 K, depending on the salt. Comparison of the experimental data to values calculated from the correlations indicates that viscosities can be calculated to within ±3%, surface tensions within ±2%, and thermal conductivities within ±3%.