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Impact of contamination of a metallic surface on its thermal absorptivity
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SYSNO ASEP 0618877 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Impact of contamination of a metallic surface on its thermal absorptivity Author(s) Frolec, Jiří (UPT-D) RID, ORCID, SAI
Králík, Tomáš (UPT-D) RID, ORCID, SAI
Krutil, Vojtěch (UPT-D) ORCID, RID, SAINumber of authors 3 Source Title Cryogenics 2023. The 17th IIR International Conference, Dresden, Germany, April 25-28, 2023. Proceedings. - Paris : International Institute of Refrigeration, 2023 - ISSN 0151-1637 - ISBN 978-2-36215-053-1 Pages s. 59-64 Series Refrigeration Science and Technology Number of pages 6 s. Publication form Online - E Action Cryogenics 2023. IIR International Conference /17./ Event date 25.04.2023 - 28.04.2023 VEvent location Dresden Country DE - Germany Event type WRD Language eng - English Country FR - France Keywords Heat Transfer ; Thermal Radiation ; Cryogenics ; Contamination ; Cryostat Design Subject RIV BJ - Thermodynamics OECD category Thermodynamics Institutional support UPT-D - RVO:68081731 UT WOS 001304903400008 DOI https://doi.org/10.18462/iir.cryo.2023.0142 Annotation Very low absorptivity values of metallic surfaces, which are often used in cryogenic systems, help to reduce the heat load transferred by thermal radiation on their cold parts. Low absorptivity may be, however, enhanced by an undesirable contaminant. Using dedicated apparatus in our laboratory, we measured total hemispherical absorptivity of a thin layer of ice, a mineral oil used in vacuum pumps, two different vacuum greases and a powdery basanite material, each applied individually in comparable amounts (approx. 0.23 mg.cm(-2)) on an aluminium surface. The contaminated surface was then exposed to thermal radiation emitted by a source at temperatures ranging from 20 K up to 280 K. Compared to the bare aluminium surface, we observed a significant increase of the original absorptivity after the contamination process and in the case of the powdery material also a nonlinear response to increasing irradiation. Our findings may have practical relevance for the design and thermal management of spacecrafts as well as ground-based cryogenic systems. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2025 Electronic address https://iifiir.org/fr/fridoc/impact-de-la-contamination-d-une-surface-metallique-sur-son-147065
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