Viscosity and Density of Aqueous Solutions of Carbon Dioxide at Temperatures from (274 to 449) K and at Pressures up to 100 MPa
Viscosity and Density of Aqueous Solutions of Carbon Dioxide at Temperatures from (274 to 449) K and at Pressures up to 100 MPa
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DOI：
10.1021/je5009125
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发表时间：
2015-01-01
期刊：
影响因子：
--
通讯作者：
Trusler, J. P. Martin
中科院分区：
文献类型：
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作者：
McBride-Wright, Mark;Maitland, Geoffrey C.;Trusler, J. P. Martin
报道了CO2摩尔分数为0.0086、0.0168和0.0271的二氧化碳水溶液的粘度和密度。测量是在单相压缩液体区域，温度在（294和449）K之间，压力高达100 MPa;额外的密度测量也在T = 274 K在相同的压力范围内。粘度用振丝粘度计测量，而密度通过振动U型管密度计测量;两者都用纯水和真空或环境空气校准。密度数据的扩展相对不确定度为0.07%，覆盖因子为2。从原始数据，CO2在水溶液中的偏摩尔体积已被确定和相关的温度和压力的经验函数。当与IAPWS-95纯水状态方程结合时，该相关性表示在+/-0.04%范围内的CO2在水中的欠饱和溶液的测量密度。粘度数据的扩展相对不确定度为1.4%，覆盖因子为2。一个修改后的Vogel-Fulcher-Tamman方程被用来关联的粘度作为温度，压力和摩尔分数的CO2的函数与0.4%的绝对平均相对偏差。饱和CO2水溶液的粘度和密度可以通过将本工作中提出的相关性与饱和CO2摩尔分数的合适模型相结合来计算。
The viscosity and density of aqueous solutions of carbon dioxide having mole fractions of CO2 of 0.0086, 0.0168, and 0.0271 are reported. The measurements were made in the single-phase compressed liquid region at temperatures between (294 and 449) K at pressures up to 100 MPa; additional density measurements were also made at T = 274 K in the same pressure range. The viscosity was measured with a vibrating-wire viscometer while the density was measured by means of a vibrating U-tube densimeter; both were calibrated with pure water and either vacuum or ambient air. The density data have an expanded relative uncertainty of 0.07 % with a coverage factor of 2. From the raw data, the partial molar volume of CO2 in aqueous solution has been determined and correlated as an empirical function of temperature and pressure. When combined with the IAPWS-95 equation of state of pure water, this correlation represents the measured densities of under-saturated solutions of CO2 in water within +/- 0.04 %. The viscosity data have an expanded relative uncertainty of 1.4 % with a coverage factor of 2. A modified Vogel-Fulcher-Tamman equation was used to correlate the viscosity as a function of temperature, pressure, and mole fraction of CO2 with an absolute average relative deviation of 0.4 %. The viscosity and density of saturated aqueous solutions of CO2 may be calculated by combining the correlations presented in this work with a suitable model for the mole fraction of CO2 at saturation.