Die Temperaturabhängigkeit der Wärmeleitfähigkeiten von gasförmigem Normal- und Ortho-Deuterium bei Temperaturen des flüssigen Wasserstoffes

Uebelhack, W.; Eichenauer, W.; Heinzinger, K.; Klemm, A.

doi:10.1515/zna-1967-1010

Cited by 4 publications

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“…appearing in [20] a n d [22] it was necessary to utilize a theoretical and semi-empirical approach since few relevant experimental data are available (30,31 For personal use only.…”

Section: Twmentioning

confidence: 99%

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Theoretical and experimental behaviour of a thermal conductivity detecter for the determination of the ortho/para hydrogen composition of gas mixtures in the temperature-jump region

Mitchell¹,

Roy²

1978

Can. J. Chem.

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The theoretical characteristics of a thermistor type thermal conductivity detector were determined for gases in the range 1 to 30 Torr, and were tested experimentally for mixtures of ortho- and para-hydrogen in pure hydrogen and in dilute mixtures of hydrogen in helium. It was found that the detector could be treated as being spherically symmetric. For temperature-jumps of up to 100 K, the total heat transfer could be adequately explained by a simplified form of the Kennard temperature-jump theory, only two parameters being required, the radius of the thermistor and its accommodation coefficient. The differential behaviour, the sensitivity to changes in ortho/para composition, required an additional parameter, the apparent gas phase relaxation rate for rotational energy.

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“…appearing in [20] a n d [22] it was necessary to utilize a theoretical and semi-empirical approach since few relevant experimental data are available (30,31 For personal use only.…”

Section: Twmentioning

confidence: 99%

“…[ By cquati~ig (d V/dX,), to the measured sensitivity at one mid-range pressure, it is possible to solvc numerically the simultaneous nonlinear eqs. [30] anti [33] for Tl%ad TI1'. The value of I is then obtained by integrating [2] between the limits T , I T I T I " (a 2 r 2 r 1 + I).…”

Section: Twmentioning

confidence: 99%

Theoretical and experimental behaviour of a thermal conductivity detecter for the determination of the ortho/para hydrogen composition of gas mixtures in the temperature-jump region

Mitchell¹,

Roy²

1978

Can. J. Chem.

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Bibliography

Chaney¹,

Ramdas²,

Rodríguez³

et al. 1982

Thermophysical Properties Research Literature Retrieval Guide 1900–1980

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Thermal Conductivity and Resonant Multipole Interactions

Nyeland

Mason

Monchick

1972

The Journal of Chemical Physics

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The influence of multipole interactions on exchanges of rotational energy in molecular collisions is'investigated by means of a simple twostate impact-parameter approximation. The calculations are restricted to linear molecules and to dipole and quadrupole-fields. The effects of such exchanges on the thermal conductivity of-gases and~of gaseous mixtures is investigated in some detail, after" correcting"the kinetic theory of mixtures to include exchanges'between unlike molecules. We find that dipolequadrupole and quadrupoleTquadrupole-'interactions can have a significant effect for molecules with'low moments n of "inertia. In particular, quadrupole interactions are important in the-hydrogen"isotopes, and the calculated corrections for H-are consistent with recent experimental work by Harris. The theory seems capable of accounting for the anomalies observed by Baker and Brokaw in HF + DF and HC1 + DC1 mixtures in terms'" of multipolar "accidental" resonances.

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Die Temperaturabhängigkeit der Wärmeleitfähigkeiten von gasförmigem Normal- und Ortho-Deuterium bei Temperaturen des flüssigen Wasserstoffes

Abstract: The relative difference of the thermal conductivities of gaseous ortho- and normal-deuterium has been measured at three different temperatures 18,5°K, 19,8°K and 21,1°K. The results are 0,97 ·10

Cited by 4 publications

References 0 publications

Theoretical and experimental behaviour of a thermal conductivity detecter for the determination of the ortho/para hydrogen composition of gas mixtures in the temperature-jump region

Theoretical and experimental behaviour of a thermal conductivity detecter for the determination of the ortho/para hydrogen composition of gas mixtures in the temperature-jump region

Bibliography

Thermal Conductivity and Resonant Multipole Interactions

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