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Thermophysical property measurements: the journey from accuracy to fitness for purpose

Thermophysical property measurements: the journey from accuracy to fitness for purpose
Thermophysical property measurements: the journey from accuracy to fitness for purpose
Until the 1960s much of the experimental work on the thermophysical properties of fluids was devoted to the development of methods for the measurement of the properties of simple fluids under moderate temperatures and pressures. By the end of the 1960s a few methods had emerged that had both a rigorous mathematical description of the experimental method and technical innovation to render measurements precise enough to rigorously test theories of fluids for both gas and liquid phases. These studies demonstrated that, for the gas phase at least, the theories were exceedingly reliable and led to physical insight into simple molecular interactions. The thesis of this paper is, after those early successes, there has been a divergence of experimental effort from the earlier thrust and, in the future, there needs to be focus on in situ measurement of properties for process fluids. These arguments are based upon the balance between the uncertainty of the results and their utility and economic value as well as upon technical developments, which have provided reliable and robust sensors of properties. The benefits accrued from accurate measurements on a few materials to validate predictions of the physical properties, for a much wider set of mixtures over a wide range of conditions, are much less relevant for most engineering purposes. However, there remain some special areas of science where high accuracy measurements are an important goal.
density, electrically conducting, intermolecular pair potentials, mems, optical, sound speed, thermal conductivity, vibrating wire, viscosity
0195-928X
372-416
Wakeham, W.A.
88549729-a39a-497f-b112-feaa6be2c449
Assael, M.A.
5ac0f800-2833-4a07-a3d6-3a6a12e2e5ba
Atkinson, J.K.
5e9729b2-0e1f-400d-a889-c74f6390ea58
Bilek, J.
29073426-9213-4da4-9bbe-b65a2a488483
Fareleira, J.M.N.A.
95b227ea-a943-49ee-8e01-5d2f5c903a6a
Fitt, A.D.
51b348d7-b553-43ac-83f2-3adbea3d69ab
Goodwin, A.R.H.
73088122-b05f-4a88-bc9b-eb4f5127489e
Oliveira, C.M.B.P.
fb65b5cc-a65f-496f-840d-97a9e6ff7853
Wakeham, W.A.
88549729-a39a-497f-b112-feaa6be2c449
Assael, M.A.
5ac0f800-2833-4a07-a3d6-3a6a12e2e5ba
Atkinson, J.K.
5e9729b2-0e1f-400d-a889-c74f6390ea58
Bilek, J.
29073426-9213-4da4-9bbe-b65a2a488483
Fareleira, J.M.N.A.
95b227ea-a943-49ee-8e01-5d2f5c903a6a
Fitt, A.D.
51b348d7-b553-43ac-83f2-3adbea3d69ab
Goodwin, A.R.H.
73088122-b05f-4a88-bc9b-eb4f5127489e
Oliveira, C.M.B.P.
fb65b5cc-a65f-496f-840d-97a9e6ff7853

Wakeham, W.A., Assael, M.A., Atkinson, J.K., Bilek, J., Fareleira, J.M.N.A., Fitt, A.D., Goodwin, A.R.H. and Oliveira, C.M.B.P. (2007) Thermophysical property measurements: the journey from accuracy to fitness for purpose. International Journal of Thermophysics. Proceedings of the Fifteenth Symposium on Thermophysical Properties, Part II, 28 (2), 372-416. (doi:10.1007/s10765-007-0189-8).

Record type: Article

Abstract

Until the 1960s much of the experimental work on the thermophysical properties of fluids was devoted to the development of methods for the measurement of the properties of simple fluids under moderate temperatures and pressures. By the end of the 1960s a few methods had emerged that had both a rigorous mathematical description of the experimental method and technical innovation to render measurements precise enough to rigorously test theories of fluids for both gas and liquid phases. These studies demonstrated that, for the gas phase at least, the theories were exceedingly reliable and led to physical insight into simple molecular interactions. The thesis of this paper is, after those early successes, there has been a divergence of experimental effort from the earlier thrust and, in the future, there needs to be focus on in situ measurement of properties for process fluids. These arguments are based upon the balance between the uncertainty of the results and their utility and economic value as well as upon technical developments, which have provided reliable and robust sensors of properties. The benefits accrued from accurate measurements on a few materials to validate predictions of the physical properties, for a much wider set of mixtures over a wide range of conditions, are much less relevant for most engineering purposes. However, there remain some special areas of science where high accuracy measurements are an important goal.

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More information

Published date: April 2007
Keywords: density, electrically conducting, intermolecular pair potentials, mems, optical, sound speed, thermal conductivity, vibrating wire, viscosity

Identifiers

Local EPrints ID: 47632
URI: http://eprints.soton.ac.uk/id/eprint/47632
ISSN: 0195-928X
PURE UUID: 7bc50edb-7dd4-4ee6-a456-5a7a6bbd7c13
ORCID for J.K. Atkinson: ORCID iD orcid.org/0000-0003-3411-8034

Catalogue record

Date deposited: 09 Aug 2007
Last modified: 03 Dec 2019 02:08

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Contributors

Author: W.A. Wakeham
Author: M.A. Assael
Author: J.K. Atkinson ORCID iD
Author: J. Bilek
Author: J.M.N.A. Fareleira
Author: A.D. Fitt
Author: A.R.H. Goodwin
Author: C.M.B.P. Oliveira

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