Experimental Study of the Effect of Temperature, Pressure, and Concentration on the Viscosity of Aqueous KBr Solutions
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- 作者：Ilmutdin Abdulagatov and Nazim Azizov
- 关键词：Aqueous solution ; Viscosity B ; coefficient ; Capillary viscometer ; Potassium bromide ; Viscosity ; Water
- 刊名：Journal of Solution Chemistry
- 出版时间：January, 2008
- 出版年：2008
- 期刊代码：24_00959782
- 类别：en
- 卷：37
- 期：1
- 页码：3-26
- 数据来源：sp
摘要
The viscosity of five (0.1240, 0.2378, 0.4645, 0.9440, and 2.2310 mol⋅kg−1) binary aqueous KBr solutions have been measured with a capillary flow technique. Measurements were made at pressures up to 30 MPa for the temperature range 298 to 577 K. The total uncertainties of the viscosity, pressure, temperature, and composition measurements were estimated to be less than 1.6%, 0.05%, 15 mK, and 0.02%, respectively. The temperature and pressure coefficients of the viscosity of KBr(aq) were studied as a function of molality and temperature. The measured viscosities were compared with data, predictions and correlations previously reported in the literature. The viscosity data were used to accurately calculate the physical-meaningful parameters (viscosity A- and B-coefficients) of the extended Jones-Dole equation for the relative viscosity (η/η 0). Various theoretical models {absolute rate theory, Tammann-Tait-Gibson (TTG) model, and extended Einstein model} were used to accurately represent the measured viscosities. Values of hydrodynamic molar volume V k (effective rigid molar volume of the salt) were calculated using the present experimental data. The high-pressure viscosity measurements were used to test the predictive capability of the TTG model.