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Dual-capillary apparatus for accurate density measurements of supercooled water
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SYSNO ASEP 0490827 Druh ASEP A - Abstrakt Zařazení RIV O - Ostatní Název Dual-capillary apparatus for accurate density measurements of supercooled water Tvůrce(i) Blahut, Aleš (UT-L) RID, ORCID
Duška, Michal (UT-L) RID, ORCID
Hykl, Jiří (UT-L) RID, ORCID
Peukert, Pavel (UT-L) RID
Vinš, Václav (UT-L) RID, ORCID
Čenský, Miroslav (UT-L)
Hrubý, Jan (UT-L) RID, ORCIDCelkový počet autorů 7 Zdroj.dok. Twentieth Symposium on Thermophysical Properties. - Boulder : University of Colorado Boulder, 2018 Poč.str. 1 s. Forma vydání Online - E Akce Symposium on Thermophysical Properties /20./ Datum konání 24.06.2018 - 29.06.2018 Místo konání Boulder Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova density ; supercooled wate ; experiment Vědní obor RIV BJ - Termodynamika Obor OECD Thermodynamics CEP GA16-02647S GA ČR - Grantová agentura ČR EF16_019/0000753 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GA17-08218S GA ČR - Grantová agentura ČR Institucionální podpora UT-L - RVO:61388998 Anotace The properties of supercooled water are interesting from the point of view of fundamental physics underlying the strong anomalies in the supercooled region. At the same time, they are important in many applications (e.g. meteorology, aerospace engineering, cryobiology). Recently, an equation of state has been developed for the region of supercooled water which represents the existing data to within their uncertainties. Further progress in this field depends on the availability of experiments either extending deeper into the supercooled region or providing a significantly better accuracy than the present data. An apparatus designed for high accuracy density measurements of supercooled water up to pressures of 200 MPa has been recently constructed at the Institute of Thermomechanics of the Czech Academy of Sciences. We report about its design and show examples of measured data. The principle of the measurement is based on volume changes of liquid enclosed in custom-treated fused silica capillaries associated with temperature change between a supercooled state and a reference state at the same pressure and a reference temperature (e.g. 298.15 K). Measurement are performed in two capillaries of different length to eliminate the effect of temperature transition. Positions of menisci are measured optically through sapphire windows using a high-resolution camera equipped with a telecentric lens and a glass scale attached to the capillaries. Very high accuracy (uncertainty at the level of 0.01% in density) is enabled by the fact that fused silica has a very small (and well known) coefficient of thermal expansion and the capillary is pressurized from both sides, so that the very small pressure coefficient is only given by the bulk modulus of fused silica. Pracoviště Ústav termomechaniky Kontakt Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Rok sběru 2019 Elektronická adresa https://thermosymposium.nist.gov/pdf/Abstract_4039.pdf
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