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Thermophysical property measurements: the journey from accuracy to fitness for purpose
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Advisor(s)
Abstract(s)
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.
Description
Keywords
Density Electrically conducting Intermolecular pair potentials MEMS Optical Sound speed Thermal conductivity Vibrating wire Viscosity
Pedagogical Context
Citation
Oliveira, Carla Padrel de [et al.] - Thermophysical property measurements: the journey from accuracy to fitness for purpose. "International Journal of Thermophysics" [Em linha]. ISSN 0195-928X (Print) 1572-9567 (Online). Vol. 28, nº 2 (Abril 2007), p. 372-416