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Thermal Conductivities and Prandtl Numbers of Nitrogen from 133 Deg to 740 Deg K Between 1 and 240 Atmospheres.

Wood RE; Baer FW; Boone WJ
NTIS: PB 203 653 :34 pages
The temperature dependency of the low-density thermal conductivity coefficients, ^t, of nitrogen, 100 deg to 1,200 deg k, is correlated with the keyes' equation, ^t = at1/2 / (1 + bt-1 10-1/2t). The equation ^t,p = ^t + a[(ap/at)v]b represented 509 experimental higher pressure thermal conductivities in the temperature range 131.2 Deg to 973.15 Deg k for pressures to 500 atmospheres, with a mean absolute deviation of 2.35 percent. This equation was used to compute thermal conductivities of gaseous nitrogen for 47 pressures, 1 to 240 atmospheres, and 110 temperatures, 133 deg to 740 deg k, which are common to conditions encountered in the Bureau of Mines helium purification process. Isobaric heat capacities, cp, and viscosities, nt,p, from previous work were combined with thermal conductivities, ^t,p, to compute prandtl numbers, cpnt,p/^t,p, of nitrogen. Tabular values of prandtl numbers are presented for 49 pressures, 1 to 240 atmospheres, and 75 temperatures, 133 deg to 740 deg k. Estimated uncertainties are +/-5 percent in the tabulated thermal conductivities and +/- 15 percent for the computed prandtl numbers. However, the uncertainty may rise to +/-10 percent for thermal conductivities and to +/-30 percent for prandtl numbers as the critical conditions of nitrogen are approached.
Publication Date
Document Type
IH; Report of Investigation;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7541
Source Name
NTIS: PB 203 653
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division