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Thermal conductivity of nitrogen in the temperature range 350–2500 K

1975; Taylor & Francis; Volume: 29; Issue: 5 Linguagem: Inglês

10.1080/00268977500101321

1362-3028

S.C. Saxena, S.H.P. Chen,

Advanced Thermodynamics and Statistical Mechanics

Abstract The thermal conductivity of nitrogen is determined in a conductivity column instrument in the temperature range of 338 to 2518 K with an estimated uncertainty of about ± 1·5 per cent. The experimental data points are correlated by a cubic polynomial in temperature, viz. k(T)/(mW m-1 K-1) = 12·18 + 0·05224(T/K) - 0·6482 × 10-6(T/K)2 - 0·2765 × 10-9(T/K)3. These conductivity values determined from heat transfer data taken in the continuum regime are found to be in fair agreement with the values obtained from similar data referring to low pressure range. The present results are compared with the conductivity determinations of other workers and with the predictions of various theories developed for polyatomic gases. It is pointed out that a reliable calculation of thermal conductivity over an extended temperature range is impossible at the present time due to the absence of a large variety of experimental molecular data needed for such an effort. Average values of the vibrational energy diffusion coefficient, D vib, are computed from the present k(T) data.