Absolute determination of the thermal conductivity of the noble gases and two of their binary mixtures as a function of density
Absolute determination of the thermal conductivity of the noble gases and two of their binary mixtures as a function of density
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DOI：
10.1039/f19817700439
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
Marc J. Assael;M. Dix;A. Lucas;W. Wakeham
中科院分区：
文献类型：
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作者：
Marc J. Assael;M. Dix;A. Lucas;W. Wakeham
本文报道了氦、氖、氩、氪、氙单原子气体和氦氖、氩氪二元混合气体热导率的绝对测量。测量在35 °C和0.5-10 MPa压力范围内的瞬态热线装置中进行。所报道的热导率数据的总体不确定性估计为± 0.2%，这一估计通过与相同气体的低密度粘度的比较而得到证实。结果发现，只有采用三级动力学理论表达式，才能充分代表零密度极限下的二元混合物的数据。最近提出的一个计划致密气体混合物的热导率的评价被发现足以代表氩+氪的数据。然而，对于氦+氖的混合物，所提出的计划需要修改，以提供一个令人满意的描述的实验数据。
The paper reports absolute measurement of the thermal conductivity of the monatomic gases helium, neon, argon, krypton and xenon and of binary mixtures of helium and neon and argon and krypton. The measurements have been carried out in a transient hot-wire apparatus at 35 °C and in the pressure range 0.5–10 MPa. The overall uncetainty in the reported thermal conductivity data is estimated to be ±0.2%, an estimate which is confirmed by a comparison with low density viscosities for the same gases.The experimental thermal conductivity for each system studied conforms to a polynomial expansion in density. It is found that the data for the binary mixtures in the limit of zero density can only be adequately represented if third-order kinetic theory expressions are employed. A recently proposed scheme for the evaluation of the thermal conductivity of dense gas mixtures is found to represent the data for argon + krypton adequately. However, for helium + neon mixtures the proposed scheme required modifications in order to provide a satisfactory description of the experimental data.