The thermal conductivity of argon at elevated densities

Michels, Andreas; Sengers, J. V.; Klundert, L.J.M. van de

doi:10.1016/s0031-8914(63)80201-3

Cited by 94 publications

(32 citation statements)

References 22 publications

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“…Good measurements of the thermal conductivity of argon were made by Michels et al [18]. Th e values at 0 and 25°C for a pressure of 1 X 10 5 Pa atmosphere are 1.633 X 10-2 w m-I K-I and 1.758 X 10-2 w m-I K -t, differing from the results in this paper by -1.1 percent and -0.4 percent, res pectively.…”

Section: Discussioncontrasting

confidence: 57%

Thermal conductivity of gases. III. Some values of thermal conductivities of argon, helium, and nitrogen from 0 C to 75 C at pressures of 1 x 10^5 to 2.5 x 10^7 pascals

Guildner¹

1975

J. RES. NATL. BUR. STAN. SECT. A.

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Acc urate meas ureme nts of th e t herm al co ndu c ti viti e.s of Ar an d He ag ree with th e th eor.e ti cal va lu e of 2.51>7)c,. (7) = viscos it y, c,. =s pec i/l c hea t ca pacit y a t co ns ta nt vo lum e 1> is a nu m~e r s hghtl y gre ate r th a n 1 de pe ndin g u po n th e inte rm olec ul ar pote nti a l). Me as u!·e m e nts of th e the r ma l co nd~c.ti viti es of N, at 9.6 a nd 75°C as a fu ncti on of press ure up to 2.53 X 10' Pa help to app raIse th e va lt d lt y of o th e r meas ure me nt s of th e th e rm al co nd uc ti viti es of de nse gases. T he excess co nd uctI VIt y of nItroge n (th e ad diti o na l co nd uc ti vity resu ltin g fro m press ure) is s hown to be a fun c ti o n of o nl y th e de ns ity of th e nitroge n fro m 0 to 700 °C a nd pre ss ures u p to 1.3 X 10 8 P a.... . Key wo rd s : Ex cess th e rma l co nd ucti vit y of N2; th e rm a l co ndu ctI VIt y of Ar; th e r ma l co nd uc ll vlt y of He; th e rm a l co nd uc ti vit y of N,.

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Section: Discussioncontrasting

confidence: 57%

Thermal conductivity of gases. III. Some values of thermal conductivities of argon, helium, and nitrogen from 0 C to 75 C at pressures of 1 x 10^5 to 2.5 x 10^7 pascals

Guildner¹

1975

J. RES. NATL. BUR. STAN. SECT. A.

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“…However, considering the reproducibility to be ± 0.6 percent, and considering that the deviation of a set of AT data from its regression straight line is quite often closer to 0.8 percent, we shall regard the 0.3 percent obtained in the low density extrapolation as a fortunate coincidence, and claim an overall accuracy of ± 1 percent for the values of thermal conductivity. [12] and values by Le Neindre, et al [13]. The four sets of data agree within their mutual uncertainties of ± 1.0 percent, ± 0.3 percent, ± 2 percent and ± 3 percent respectively.…”

Section: Performance Of the Instrumentsupporting

confidence: 72%

“…Dymond [10], in an extension of the hard sphere model to dilute gases, found that for temperatures up to 1.7 T c the thermal conductivities of argon determined by Michels, et al [12] and Le Neindre, et al [13] showed a similar critical enhancement, larger than the one reported here because of the lower temperatures involved. Dymond concluded that the hard sphere model is unable to account for the anomalous behavior of the thermal conductivity data.…”

Section: Description Of the Instrumentsupporting

confidence: 64%

“…Included for comparison in figures 6 and 7 are the experimental thermal conductivities of Kestin,et al (2] and the values predicted by the correlation of Hanley, et al (22]. The latter is based on the data reported by Michels, et al (12] and Le Neindre, et al [13]. We propose that there is an anomalous increase in the thermal conductivity which we attribute to a critical enhancement even though the temperature here T"o," = 300.65 K is about twice the critical temperature.…”

Section: Performance Of the Instrumentmentioning

confidence: 97%

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Absolute Determination of the Thermal Conductivity of Argon at Room Temperature and Pressures Up to 68 Mpa

deCastro¹,

Roder²

1981

J. RES. NATL. BUR. STAN.

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The thermal conductivity of argon at room temperature and for pressures up to 68 MPa has been measured with a transient hot-wire technique in order to assess the accuracy of an instrument of this type. The data are presented for a nominal temperature of 300.65 K and comparison with other authors shows that our data is accurate to within ± I percent, and it is the most accurate set of data for pressures above 35 MPa. Experimental evidence of a thermal conductivity enhancement near the critical density for a temperature about twice the critical temperature is herein reported. The experimental data were compared with the values predicted by the hard sphere model and it has been found that the theory gives values that are about 4 percent lower than the experimental ones in the density range 0-400 kg/m 3 and about 1 to 2 percent lower in the high density region 400-825 kg/m 3 •

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“…0.0386(bf)^ + 0.0127(bp)^+ O.OO^Cbp)^* (32) According to Eq. (31), the ratio X/ X, for rigid spheres is a temperature independent function of the reduced density bp .…”

mentioning

confidence: 99%

Ninth Conference on Thermal Conductivity, Iowa State University, Ames, Iowa, October 6--8, 1969.

Shanks¹

1970

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The thermal conductivity of argon at elevated densities

Cited by 94 publications

References 22 publications

Thermal conductivity of gases. III. Some values of thermal conductivities of argon, helium, and nitrogen from 0 C to 75 C at pressures of 1 x 10^5 to 2.5 x 10^7 pascals

Thermal conductivity of gases. III. Some values of thermal conductivities of argon, helium, and nitrogen from 0 C to 75 C at pressures of 1 x 10^5 to 2.5 x 10^7 pascals

Absolute Determination of the Thermal Conductivity of Argon at Room Temperature and Pressures Up to 68 Mpa

Ninth Conference on Thermal Conductivity, Iowa State University, Ames, Iowa, October 6--8, 1969.

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