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Original title:
Factors Influencing Thermal Radiative Properties of Metals
Authors: Králík, Tomáš ; Hanzelka, Pavel ; Musilová, Věra ; Srnka, Aleš
Document type: Papers
Conference/Event: Cryogenics 2014. The IIR International Conference /13./, Praha (CZ), 2014-04-07 / 2014-04-11
Year: 2014
Language: eng
Abstract: Data on thermal absorptivity and emissivity are important for calculations of heat flows in cryogenic devices. Although thermal radiative properties of materials used in cryogenics are measured, published and used for more than sixty years we have noticed that sometimes users of that data don’t well understand the significance of individual factors influencing thermal radiative properties. The sensitivity of the thermal radiative properties of metals to the condition of the surface and the difficulty of measurement, especially at low temperatures is probably the reason of dispersion of the published values. The effect of the material and its purity, finishing (machining, mechanical or chemical polishing) and of the protective coatings or accidental layers (water, oxidation) on the thermal radiative properties is not always obvious. Influence of the material, surface treatment, roughness and layers on the surface is discussed on the basis of our 20 year experience with measurement of the emissivity and absorptivity in the range from 20 K to 300 K.
Keywords: absorptivity; cryogenics; emissivity; radiative heat transfer; surface finish
Project no.: LO1212 (CEP), ED0017/01/01, GA14-07397S (CEP)
Funding provider: GA MŠk, GA MŠk, GA ČR
Host item entry: Cryogenics 2014. The 13th IIR International Conference Proceedings, ISBN 978-2-36215-002-9, ISSN 0151-1637
Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0238158
Permalink: http://www.nusl.cz/ntk/nusl-177520
The record appears in these collections:
Research > Institutes ASCR > Institute of Scientific Instruments
Conference materials > Papers
Authors: Králík, Tomáš ; Hanzelka, Pavel ; Musilová, Věra ; Srnka, Aleš
Document type: Papers
Conference/Event: Cryogenics 2014. The IIR International Conference /13./, Praha (CZ), 2014-04-07 / 2014-04-11
Year: 2014
Language: eng
Abstract: Data on thermal absorptivity and emissivity are important for calculations of heat flows in cryogenic devices. Although thermal radiative properties of materials used in cryogenics are measured, published and used for more than sixty years we have noticed that sometimes users of that data don’t well understand the significance of individual factors influencing thermal radiative properties. The sensitivity of the thermal radiative properties of metals to the condition of the surface and the difficulty of measurement, especially at low temperatures is probably the reason of dispersion of the published values. The effect of the material and its purity, finishing (machining, mechanical or chemical polishing) and of the protective coatings or accidental layers (water, oxidation) on the thermal radiative properties is not always obvious. Influence of the material, surface treatment, roughness and layers on the surface is discussed on the basis of our 20 year experience with measurement of the emissivity and absorptivity in the range from 20 K to 300 K.
Keywords: absorptivity; cryogenics; emissivity; radiative heat transfer; surface finish
Project no.: LO1212 (CEP), ED0017/01/01, GA14-07397S (CEP)
Funding provider: GA MŠk, GA MŠk, GA ČR
Host item entry: Cryogenics 2014. The 13th IIR International Conference Proceedings, ISBN 978-2-36215-002-9, ISSN 0151-1637
Institution: Institute of Scientific Instruments AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0238158
Permalink: http://www.nusl.cz/ntk/nusl-177520
The record appears in these collections:
Research > Institutes ASCR > Institute of Scientific Instruments
Conference materials > Papers
Record created 2014-11-13, last modified 2021-11-24