Viscosity of aqueous Na2SO4 solutions at temperatures from 298 to 573K and at pressures up to 40MPa

Viscosity

“…The data of Abdulagatov et al (2005) were found to agree within 1.5%, with the data reported by Pepinov et al (1978) at high pressures (10 and 30 MPa) and concentrations of 5 and 10 mass %, while at low pressures the deviations were within 0.6%. Excellent agreement, 0.7% was found between the measurements of Abdulagatov et al (2005) and those of Puchkov and Sargaev (1974) at concentrations of 15 and 20 mass % and at temperatures up to 348 K, while at low temperatures (298.15 K), deviations rose up to 2%. Hence, it seems that the deviations of these datasets are within the quoted mutual uncertainty of each investigator.…”

“…H 2 O + Na 2 SO 4 : Four datasets were found, referring to three research groups (Puchkov and Sargaev, 1974;Pepinov et al, 1978;Pepinov, 1992;Abdulagatov et al, 2005). In this case, the agreement between the various data sets is generally good.…”

“…Figure 6.1 shows a schematic diagram of a typical capillary viscometer (Pepinov et al 1978(Pepinov et al , 1979a(Pepinov et al ,b, 1983(Pepinov et al , 1986(Pepinov et al , 1988(Pepinov et al , 1989Abdullaev et al 1990Abdullaev et al , 1991aAkhundov et al, 1990aAkhundov et al, ,b, 1991bAbdullaev, 1991;Zeynalova et al 1990Zeynalova et al , 1991Pepinov, 1992;Iskenderov, 1996;Azizov, 1996Azizov, , 1999Azizov and Akhundov, 1997;Abdulagatov and Azizov, 2003, 2005a-d, 2006a,b, and Abdulagatov et al 2004, 2005. They all employed a very similar Abdulagatov and Azizov.…”

“…To extend the validity of Equation (6.41) to higher concentrations, Jones and Talley (1933), Kaminsky (1955Kaminsky ( , 1956Kaminsky ( , 1957, Feakins and Lawrence (1966), Robertson and Tyrrell (1969), Desnoyers et al (1969), Desnoyers and Perron (1972), Abdulagatov et al (2004Abdulagatov et al ( , 2005 and Abdulagatov and Azizov, 2006a,b), added a quadratic term Dc 2 (extended Jones-Dole equation), as η η 0 2 1 = + + + A c Bc Dc .…”

“…It was proposed that the new term in Equation (6.42) accounted for solute-solvent and solute-solute structural interactions at high concentrations (Stokes and Mills, 1965;Desnoyers and Perron, 1972) such as: long-range Coulombic forces; high term hydrodynamic effects; and effects arising from changes in solute-solvent interactions due to concentration changes. Finally, Abdulagatov et al (2004Abdulagatov et al ( , 2005,b) included one further term, Fc 2.5 , as and thus increased the validity of the equation up to saturated concentration. Grimes et al (1979) and Kestin and Shankland (1984b) omitted the square-root term owing to its small magnitude, and proposed an equation of the form (6.45) Grimes et al (1979) and Kestin and Shankland (1984b) employed successfully the aforementioned equation to describe the behavior of the systems H 2 O + NaCl and H 2 O + KCl.…”