Relation Between Wire Resistance and Fluid Pressure in the Transient Hot-Wire Method

The resistance of metals is a function of applied pressure, and this dependence is large enough to be significant in the calibration of transient hot-wire thermal conductivity instruments. We recommend that for the highest possible accuracy, the instrument’s hot wires should be calibrated in situ. I...

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Detalles Bibliográficos
Autores principales: Roder, H. M., Perkins, R. A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1989
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4962892/
https://www.ncbi.nlm.nih.gov/pubmed/28053405
http://dx.doi.org/10.6028/jres.094.014
Descripción
Sumario:The resistance of metals is a function of applied pressure, and this dependence is large enough to be significant in the calibration of transient hot-wire thermal conductivity instruments. We recommend that for the highest possible accuracy, the instrument’s hot wires should be calibrated in situ. If this is not possible, we recommend that a value of γ, the relative resistance change with pressure, of −2×10(−5) MPa(−1) be used to account for the pressure dependence of the platinum wire’s resistance.

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