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New Results on the Thermal Conductivity of the Noble Gases and of Two Binary Mixtures

  • Joseph Kestin
  • Richard Fleeter
  • W. A. Wakeham

Abstract

The paper discusses new data on the thermal conductivity of the noble gases and of the binary mixtures Ar-Ne and Ar-He, all at zero density and 27.5°C.

First a comparison is made between a third-approximation calculation for the pure gases, based on kinetic theory coupled with our extended law of corresponding states. The calculation reproduces our measurements with a systematic error of order 1%. The same calculational scheme reproduces viscosity with a marginally smaller systematic error of the same sign. This calculation (easy to program) is recommended if a 1% accuracy is adequate. Work on an improved scheme is in progress.

As far as binary mixtures are concerned, it is necessary to recognize that our transient hot-wire instrument measures the “steady-state” thermal conductivity which characterizes heat conduction in the presence of a composition gradient induced by thermal diffusion in the limit of zero mass flux. A comparison between measurement and first-order calculation results in a maximum deviation of 4.5%, whereas a correction to third order reduces it to 3%. Analogous data for viscosity show a deviation of no more than 3% from a first-order calculation. This calculation, not too difficult to program, can be recommended if an accuracy of 4–5% is adequate.

Since the deviations are systematic in all cases it is concluded that the inner consistency of our measurements is better than the preceding comparison would suggest. An improved scheme is here also possible.

Keywords

Thermal Conductivity Binary Mixture Mass Flux Composition Gradient Calculational Scheme 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Purdue Research Foundation 1983

Authors and Affiliations

  • Joseph Kestin
    • 1
  • Richard Fleeter
    • 1
  • W. A. Wakeham
    • 2
  1. 1.Brown UniversityUSA
  2. 2.Imperial CollegeUK

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