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Statements

Subject Item
n2:RIV%2F68081731%3A_____%2F14%3A00434010%21RIV15-GA0-68081731
rdf:type
skos:Concept n15:Vysledek
dcterms:description
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. 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.
dcterms:title
Factors Influencing Thermal Radiative Properties of Metals Factors Influencing Thermal Radiative Properties of Metals
skos:prefLabel
Factors Influencing Thermal Radiative Properties of Metals Factors Influencing Thermal Radiative Properties of Metals
skos:notation
RIV/68081731:_____/14:00434010!RIV15-GA0-68081731
n3:aktivita
n14:P n14:I
n3:aktivity
I, P(ED0017/01/01), P(GA14-07397S), P(LO1212)
n3:dodaniDat
n12:2015
n3:domaciTvurceVysledku
n4:1160877 n4:3626636 n4:7388837 n4:5565103
n3:druhVysledku
n20:D
n3:duvernostUdaju
n10:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
16354
n3:idVysledku
RIV/68081731:_____/14:00434010
n3:jazykVysledku
n16:eng
n3:klicovaSlova
emissivity; absorptivity; radiative heat transfer; surface finish; cryogenics
n3:klicoveSlovo
n7:surface%20finish n7:radiative%20heat%20transfer n7:emissivity n7:absorptivity n7:cryogenics
n3:kontrolniKodProRIV
[CA623595B60A]
n3:mistoKonaniAkce
Praha
n3:mistoVydani
Praha
n3:nazevZdroje
Cryogenics 2014. The 13th IIR International Conference Proceedings
n3:obor
n8:BM
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
4
n3:projekt
n9:GA14-07397S n9:LO1212 n9:ED0017%2F01%2F01
n3:rokUplatneniVysledku
n12:2014
n3:tvurceVysledku
Srnka, Aleš Musilová, Věra Králík, Tomáš Hanzelka, Pavel
n3:typAkce
n19:WRD
n3:wos
000346089100039
n3:zahajeniAkce
2014-04-07+02:00
s:issn
0151-1637
s:numberOfPages
9
n17:hasPublisher
Icaris
n18:isbn
978-2-36215-002-9