Thermal Conductivity and Viscosity of Aqueous K2SO4 Solutions at Temperatures from 298 to 575 K and at Pressures up to 30 MPa

Abstract

The thermal conductivity of three (0.239, 0.499, and 0.782 mol·kg −1 ) and the viscosity of four (0.0658, 0.2055, 0.3050, and 0.4070 mol·kg −1 ) binary aqueous K 2 SO 4 solutions have been measured with coaxial-cylinder (steady-state) and capillary-flow techniques, respectively. Measurements were made at pressures up to 30 MPa, and the range of temperature was 298-575 K. The total uncertainties of the thermal conductivity, viscosity, pressure, temperature, and composition measurements were estimated to be less than 2%, 1.6%, 0.05%, 30 mK, and 0.02%, respectively. The measured values of the thermal conductivity and viscosity of K 2 SO 4 (aq) were compared with data and correlations reported in the literature. The reliability and accuracy of the experimental method was confirmed with measurements on pure water with well known (IAPWS standards) thermal conductivity and viscosity values (deviations, AAD, within 0.31 % and 0.52 %, respectively). The values of the viscosity A-, B-, and D-coefficients of the extended Jones-Dole equation for the relative viscosity (η/η 0 ) of aqueous K 2 SO 4 solutions as a function of temperature were studied. The maximum of the Bcoefficient near 340 K has been found. The derived values of the viscosity A-and B-coefficients were compared with results predicted by the Falkenhagen-Dole theory of electrolyte solutions and calculated with the ionic B-coefficient data. The behavior of the concentration dependence of the relative viscosity of aqueous K 2 SO 4 solutions is discussed in terms of the modern theory of transport phenomena in electrolyte solutions. 5930195-928X/05/0500-0593/0

Modeling Thermal Conductivity of Electrolyte Mixtures in Wide Temperature and Pressure Ranges: Seawater and Its Main Components

“…The model has been applied to aqueous systems containing the Na + , K + , Mg 2+ , Ca 2+ , Cl − , SO 4 2− , HCO 3 − , CO 3 2− , and Br − ions. A substantial amount of experimental data is available for these systems in the literature.…”

“…composition on the thermal conductivity of binary and multicomponent salt solutions [1][2][3][4][5][6][7][8][9][10][11][12]. Thus, an extensive database exists that makes it possible to develop a comprehensive model for thermal conductivity.…”

“…Such systems contain primarily the Na + , K + , Mg 2+ , Ca 2+ , Cl − , SO 4 2− , CO 3 2− , and HCO 3 − ions in various concentrations. Of particular interest is the thermal conductivity of seawater in wide ranges of salinity, temperature, and pressure.…”

Thermal Conductivity

“…The coaxial-cylinder apparatus and the thermal conductivity cell employed by Abdulagatov et al (2004a,b), and Abdulagatov and Azizov (2005), to measure the thermal conductivity of aqueous LiNO 3 , Sr(NO 3 ) 2 , K 2 SO 4 , NaBr, KBr, NaBr + KBr solutions at temperatures up to 591 K, is schematically shown in Figure 5.3. The main part of the apparatus consisted of a high-pressure autoclave-1, thermostat-2, and thermal conductivity cell.…”

Viscosity

“…H 2 O+K 2 SO 4 : Two datasets have been found (Puchkov and Sargaev, 1974;Abdulagatov and Azizov, 2005b).…”