Radiative heat losses in thermal conductivity measurements: a correction for linear temperature gradients
| Autor: | Jürg Hulliger, Sascha Populoh, Anke Weidenkaff, Krzysztof Gałązka, Wenjie Xie |
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| Rok vydání: | 2016 |
| Předmět: |
Applied Mathematics
Thermal resistance Thermodynamics 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Thermal diffusivity Thermal conduction 01 natural sciences Thermal transmittance Thermal conductivity measurement Thermal conductivity Thermal radiation 0103 physical sciences Heat transfer Electrical and Electronic Engineering 010306 general physics 0210 nano-technology Instrumentation |
| Zdroj: | Measurement. 90:187-191 |
| ISSN: | 0263-2241 |
| Popis: | A method for the quantification of the radiative heat losses in a steady-state thermal conductivity measurement set-up is developed based on the Stefan–Boltzmann radiation law with the assumption of a linear temperature distribution along the specimen. The resulting expression can be applied to any regular-shaped sample with well-defined side surfaces and cross-section. Owing to the quantification of the radiative heat losses the accuracy of the steady-state thermal conductivity measurement method is improved and the measurement range can be extended to higher temperatures. An exemplary application in a commercial device is presented. The results are in an excellent agreement with the independently measured high temperature thermal conductivity. |
| Databáze: | OpenAIRE |
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