Binary Diffusion Coefficients for Gas Mixtures of Propane with Methane and Carbon Dioxide Measured in a Loschmidt Cell Combined with Holographic Interferometry
Binary Diffusion Coefficients for Gas Mixtures of Propane with Methane and Carbon Dioxide Measured in a Loschmidt Cell Combined with Holographic Interferometry
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DOI：
10.1007/s10765-019-2484-6
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发表时间：
2019-02
影响因子：
2.2
通讯作者：
Pouria Zangi;M. Rausch;A. Fröba
中科院分区：
文献类型：
--
作者：
Pouria Zangi;M. Rausch;A. Fröba
分子气体系统丙烷-甲烷 (C3H8-CH4) 和丙烷-二氧化碳 (C3H8-CO2) 的二元扩散系数 D12 已使用洛施密特池与全息干涉测量相结合，在 (293 和 313) K、(0.05 和 0.5) MPa 之间以及不同的混合物成分进行测量。已针对稀有气体系统氦-氪验证的改进实验和评估程序已成功适用于分子气体系统。对于所研究的混合物，吸附-解吸过程叠加在扩散过程上，增加了可实现的不确定性。这阻碍了关于扩散系数的浓度依赖性的可靠结论。D12随着温度的升高和压力的降低而明显增加。在相同压力、温度和 C3H8 摩尔分数下，C3H8-CH4 的扩散系数大于 C3H8-CO2。对于这两个系统，所提出的扩散系数与现有文献数据相当一致。特别是，给定温度下的压力相关趋势和 D12 的绝对值与基于两个系统零密度极限的从头计算的最新理论数据相匹配。
Binary diffusion coefficientsD12for the molecular gas systems propane–methane (C3H8–CH4) and propane–carbon dioxide (C3H8–CO2) have been measured with a Loschmidt cell combined with holographic interferometry at (293 and 313) K, between (0.05 and 0.5) MPa, and for different mixture compositions. Improved experimental and evaluation procedures already validated for the noble-gas system helium–krypton have been successfully adapted for the molecular gas systems. For the investigated mixtures, adsorption–desorption processes are superimposed on the diffusion process and increase the achievable uncertainties. This hinders reliable conclusions regarding a concentration dependency of the diffusion coefficient.D12clearly increases with increasing temperature and decreasing pressure. At the same pressure, temperature, and C3H8mole fraction, the diffusion coefficient is larger for C3H8–CH4than for C3H8–CO2. For both systems, the presented diffusion coefficients are in reasonable agreement with available literature data. In particular, the pressure-dependent trend and the absolute values ofD12at a given temperature match with recent theoretical data based onab initiocalculations in the zero-density limit for both systems.