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Relative density and isobaric expansivity of cold and supercooled heavy water from 254 to 298 K and up to 100 MPa
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SYSNO ASEP 0509586 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Relative density and isobaric expansivity of cold and supercooled heavy water from 254 to 298 K and up to 100 MPa Author(s) Blahut, Aleš (UT-L) RID, ORCID
Hykl, Jiří (UT-L) RID, ORCID
Peukert, Pavel (UT-L) RID
Vinš, Václav (UT-L) RID, ORCID
Hrubý, Jan (UT-L) RID, ORCIDNumber of authors 7 Article number 034505 Source Title Journal of Chemical Physics. - : AIP Publishing - ISSN 0021-9606
Roč. 151, č. 3 (2019)Number of pages 18 s. Publication form Print - P Language eng - English Country US - United States Keywords heavy water ; supercooling ; density measurement ; equation of state Subject RIV BJ - Thermodynamics OECD category Thermodynamics R&D Projects GA16-02647S GA ČR - Czech Science Foundation (CSF) GA19-05696S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UT-L - RVO:61388998 UT WOS 000476588700016 EID SCOPUS 85069463336 DOI 10.1063/1.5100604 Annotation A dual-capillary apparatus was developed for highly accurate measurements of density of liquids, including the supercooled liquid region. The device was used to determine the density of supercooled heavy water in the temperature range from 254 K to 298 K at pressures ranging from atmospheric to 100 MPa, relative to density at reference isotherm 298.15 K. The measurements of relative density were reproducible within 10 ppm, and their expanded (k = 2) uncertainty was within 50 ppm. To obtain absolute values of density, thermodynamic integration was performed using recent accurate speed of sound measurements in the stable liquid region. An empirical equation of state (EoS) was developed, giving specific volume as a rational function of pressure and temperature. The new experimental data are represented by EoS within their experimental uncertainty. Gibbs energy was obtained by EoS integration allowing computation of all thermodynamic properties of heavy
water using Gibbs energy derivatives. Although based on data in relatively narrow temperature and pressure ranges, the developed EoS shows an excellent agreement with literature data for densities, isothermal compressibilities, and isobaric expansivities of deeply supercooled heavy water. The curvature of the thermodynamic surface steeply increases toward low temperatures and low pressures, thus supporting the existence of the hypothesized liquid-liquid coexistence boundary in a close vicinity of existing experimental data.Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2020 Electronic address https://aip.scitation.org/doi/10.1063/1.5100604
Number of the records: 1