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Knudsen-effect errors with transient line-source measurement in fluids |
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| Authors: | J. E. S. Venart R. C. Prasad G. Wang |
| Affiliation: | (1) Department of Mechanical Engineering, University of New Brunswick, Frederiction, New Brunswick, Canada;(2) Division of Mathematics, Engineering and Computer Science, University of New Brunswick, Saint John, New Brunswick, Canada |
| Abstract: | This paper decribes the Knudsen-effect errors of the transient line-source method used for accurate measurements of the thermal conductivity and thermal diffusivity of fluids. The analysis demonstrates that the instrument can be used with a good accuracy (>0.5%) to lower densities than previously thought. The principal errors are illustrated by measurements on propane in the temperature range 250–300 K at densities less than 9 kg · m–3. |
| Keywords: | Knudsen effect propane thermal conductivity thermal diffusivity transient line-source method |
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