Absolute Measurements of the Thermal Conductivity of Some Aqueous Chloride Salt Solutions

New absolute measurements of the thermal conductivity of aqueous NaCl, KCl and CaCl2 solutions are presented. The concentrations studied were 10% and 20% by weight of NaCl and KCl, and 10, 20 and 30% by weight of CaCl2. The measurements were performed in a transient hot‐wire apparatus employing two thin tantalum wires coated with an anodic tantalum pentoxide insulation layer. The temperature range examined was 290 to 345 K and the pressure was atmospheric. The uncertainty of the measurements is estimated to be ±0.5%, an estimate confirmed by the measurement of the thermal conductivity of water. — Existing correlations for the thermal conductivity of aqueous inorganic salt solutions are also examined. The measurements have been used to develop a simple consistent correlative and predictive scheme that allows the correlation of the thermal conductivity of these solutions with an uncertainty of ±0.7% and the prediction of the thermal conductivity to high pressures with an uncertainty of ±2.5%.