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Equation of State of Fluid NH3 from P-V-T and Ultrasound Measurements to 12 Kbar

Published online by Cambridge University Press:  21 February 2011

R. L. Mills ,
D. H. Liebenberg ,
R. Le Sar  and
PH. Pruzan
R. L. Mills
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545;
D. H. Liebenberg
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545;
R. Le Sar
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545;
PH. Pruzan
Affiliation:
Universite Pierre et Marie Curie - Paris VI, 75230 Paris 05, France
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Abstract

A piston-cylinder apparatus was used to measure the pressure, volume, temperature, and ultrasonic velocity (P,V,T,u) of fluid NH3 from 195 to 320 K at pressures up to 12 kbar. Over 1200 sets of P-V-T-u and P-V-T data were fitted to a Tait-type equation of state (EOS) by non-linear least-squares minimization. With quadratic terms in T for the two fitted parameters, the rms deviation is ± 0.2% in V and ± 0.9% in u, which is comparable to the experimental error. The simple Tait EOS is useful over the entire fluid range between the vaporization and melting curves up to T exceeding room temperature. Measurements of u and calculations of the constant-pressure heat capacity Cp show regular behavior, differing noticeably from values given by a 44-parameter EOS recently published by NBS. It is concluded that incorporating u in the formulation of an EOS improves its self consistency markedly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 22: Symposium NY – High Pressure in Science and Technology , 1983 , 43
Copyright
Copyright © Materials Research Society 1984

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References

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