Assessment is given of physical and thermodynamic properties of sodium. FORTRAN subroutine computes enthalphy and entropy of sodium in given state, and composition, molecular weight, volume, and compressibility factor of corresponding vapor. Tabular results for saturated liquid and vapor are presented for a 500-2500 degree F range

Golden, G. H.

Tokar, J. V.

English

NASA Technical Reports Server

August 1969	 Brief 69-10240 
•UD
	
AEC-NASA TECH BRIEF 
AEC-NASA Tech Briefs describe innovations resulting from the research and development program 
of the U.S. AEC or from AEC-NASA interagency efforts. They are issued to encourage commercial 
application. Tech Briefs are published by NASA ,and may be purchased, at 15 cents each, from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
•	 _________	 ______________________________ 
Thermophysical Properties of Sodium 
.
A critical assessment and tabulation of the physical 
and thermodynamic properties of real sodium have 
been presented (I). Consideration is given to the 
liquid density, vapor pressure, thermodynamic and 
pressure-volume-temperature (PVT) properties, trans-
port properties, electrical resistivity, and surface 
tension, as well as the thermal-expansion coefficient, 
compressibility, and sonic velocity of the liquid. 
A FORTRAN subroutine was written for computa-
tion of the enthalpy and entropy of sodiunj in a given 
state, and also the composition, mean molecular 
weight, specific volume, and compressibility factor 
of the corresponding vapor. Tabular results for the 
saturated liquid and vapor are presented for the 
range from 5000 to 2,500'F. Also given are derived 
H-S and T-S diagrams. The transport properties (the 
viscosity and thermal conductivity of the saturated 
liquid and vapor) also are presented in tabular form 
for the range from 210 to 2,500°F. 
Several recent studies of sodium's related proper-
ties have been prompted by interest in sodium as a 
heat-transfer fluid and as a working fluid for power 
cycles. The large amount of information accumulated 
since 1960 had warranted an updated compilation. 
The updating was stimulated by recently published 
PVT and related measurements for saturated and 
superheated sodium vapor. From a thermodynamic 
analysis of the data it was concluded that the vapor 
contains not only the monomer and dimer, but also 
species of higher molecular weight, probably the 
tetramer. With these results the thermodynamic prop-
erties of saturated and superheated sodium were 
computed for the range from 1,6000 to 2,500°F, es-
sentially the range of the reference measurements. 
There -is, however, great interest in such values at 
temperatures well below 1,600 0 F, at which precise 
PVT measurements have not been made. Thus the
compilation of sodium properties was undertaken 
with updating wherever possible through 1966. 
The critical parameters (temperature, pressure, and 
specific volume) are not included in the compilation 
because considerable uncertainty exists regarding 
reported values, and no experimental basis is available 
for a "best choice." 
Reference: 
I. G. H. Golden and J. V. Tokar, ANL-7323 (Argonne 
National Laboratory, August 1967); available from 
the Clearinghouse for Federal Scientific and Tech-
nical Information, Springfield, Virginia 22151, at 
$3.00 (microfiche, $0.65). 
Notes: 
I. Chemical processors, heating plants, and highway-
development organizations, in addition to physical 
chemists, may be interested in this information. 
2. Inquiries may be directed to: 
Office of Industrial Cooperation 
Argonne National Laboratory 
9700 South Cass Avenue 
Argonne, Illinois 60439 
Reference: B69-10240 
Source: G. H. Golden and J. V. Tokar 
Reactor Engineering Division 
(ARG- 10363) 
Patent status: 
Inquiries concerning rights for commercial use of 
this innovation may be made to: 
Mr. George H. Lee, Chief 
Chicago Patent Group 
U.S. Atomic Energy Commission 
Chicago Operations Office 
9800 South Cass Avenue 
Argonne, Illinois 60439
Category 03 
This document was prepared under the sponsorship of the Atomic	 liability resulting from the use of the information contained in this 
Energy Commission and/or the National Aeronautics and Space document, or warrants that the use of any information, apparatus, 
Administration. Neither the United States Government nor any per-	 method, or process disclosed in this document may not infringe pri-
son acting on behalf of the United States Government assumes any vately owned rights.
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Thermophysical properties of sodium

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