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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Calibration of germanium temperature sensors of helium cryostat for experimental study of natural turbulent convection
 Urban, Pavel ; Hanzelka, Pavel ; Musilová, Věra
Experimental study of Nusselt number on Rayleigh number dependence with using of cryogenic 4He gas requires precise measurement of the temperature differenceT between the top and the bottom plates of the convection cell. A special calibration device was adapted and used for comparative calibration of germanium temperature sensors. This device enables to compare up to four sensors within the temperature range of 4.3 K – 40 K.
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Emissivity and in situ measurement of amount of water condensed on a metallic sample
 Musilová, Věra ; Hanzelka, Pavel ; Králík, Tomáš
Thermal radiation emissivity of technically pure aluminium contaminated by water condensate was obtained by measurement of the heat transferred between two parallel surfaces, the surface of the aluminium sample and of a dielectric layer used as a reference “black surface”. In situ measured water amount was derived from the heat transferred by vapour of subliming water during ramp of the sample temperature from 5 K to 300 K.
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