Concentration dependent refractive index of CO2/CH4 mixture in gaseous and supercritical phase

Giraudet C.; Marlin L.; Begue D.; Croccolo F.; Bataller H.

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Concentration dependent refractive index of CO2/CH4 mixture in gaseous and supercritical phase

机译：气态和超临界相中CO2 / CH4混合物的浓度依赖性折射率

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Carbon dioxide (CO2)/methane (CH4) binary mixtures are investigated at pressure values up to 20 MPa at 303 K in order to investigate the pressure dependence of the optical concentration contrast factor, (partial derivative n/partial derivative c)(P,T), through gaseous and supercritical phase. Refractive index is measured by means of a Michelson interferometer. Refractivities of the mixtures are found in good agreement with Lorentz-Lorenz predictions after density calculations by means of the AGA8-DC92 equation of state. Experimental polarizabilities of pure fluids are compared to quantum calculations of monomers and dimers for each pressure; it results that the quantity of dimers is small in the investigated thermodynamic conditions. Finally, by extending our experimental database with numerical simulations, we evidence that (partial derivative n/partial derivative c)(P,T) presents a critical enhancement similar to heat capacity. (C) 2016 AIP Publishing LLC.

机译：为了研究光学浓度对比因子（偏导数n /偏导数c）（P， T），通过气相和超临界相。折射率通过迈克尔逊干涉仪测量。在通过AGA8-DC92状态方程进行密度计算后，发现混合物的折射率与Lorentz-Lorenz预测非常吻合。将纯流体的实验极化率与每种压力下单体和二聚体的量子计算进行了比较。结果表明，在所研究的热力学条件下，二聚体的数量很小。最后，通过用数值模拟扩展我们的实验数据库，我们证明（偏导数n /偏导数c）（P，T）表现出与热容相似的关键性增强。（C）2016 AIP出版有限责任公司。

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《The Journal of Chemical Physics》 |2016年第13期|共10页
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Giraudet C.; Marlin L.; Begue D.; Croccolo F.; Bataller H.;
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机译：气态和超临界相中CO2 / CH4混合物的浓度依赖性折射率
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Concentration dependent refractive index of CO2/CH4 mixture in gaseous and supercritical phase

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