Thermal conductivity of aqueous KI and KBr solutions at high temperatures and high pressures

Experimental measurements are reported for the thermal conductivity of H2O + KI and H2O + KBr solutions using a parallel-plate apparatus. The measurements cover the temperature range from 293 to 473 K at pressures to 100 MPa for salt concentrations between 2.5 and 25 wt.%. The accuracy of the measurements was estimated to be +/-1.6%. The data are compared with the experimental and correlation results of other investigators. For a given concentration, the thermal conductivity was found to vary linearly with pressure. The thermal conductivity at low concentrations below 25 wt.% shows a linear dependence on concentration for all isotherms. Each isobar at a given concentration shows a thermal conductivity maximum at temperatures between 405 and 417 K. The apparent molar thermal conductivity values at 293 K for aqueous KI and KBr are calculated from derived experimental data.