NDLI: Isochoric Heat Capacity Measurements for 0.5 H$_{2}$O+0.5 D$

Content Provider	Springer Nature Link
Author	Polikhronidi, N. G. Abdulagatov, I. M. Magee, J. W. Stepav, G. V.
Copyright Year	2003
Abstract	The isochoric heat capacity C $_{ V }$ of an equimolar H$_{2}$O+D$_{2}$O mixture was measured in the temperature range from 391 to 655 K, at near-critical liquid and vapor densities between 274.05 and 385.36 kg⋅m$^{−3}$. A high-temperature, high-pressure, nearly constant-volume adiabatic calorimeter was used. The measurements were performed in the one- and two-phase regions including the coexistence curve. The uncertainty of the heat-capacity measurement is estimated to be ±2%. The liquid and vapor one- and two-phase isochoric heat capacities, temperatures, and densities at saturation were extracted from the experimental data for each measured isochore. The critical temperature and the critical density for the equimolar H$_{2}$O+D$_{2}$O mixture were obtained from isochoric heat capacity measurements using the method of quasi-static thermograms. The measurements were compared with a crossover equation of state for H$_{2}$O+D$_{2}$O mixtures. The near-critical isochoric heat capacity behavior for the 0.5 H$_{2}$O+0.5 D$_{2}$O mixture was studied using the principle of isomorphism of critical phenomena. The experimental isochoric heat capacity data for the 0.5 H$_{2}$O+0.5 D$_{2}$O mixture exhibit a weak singularity, like that of both pure components. The reliability of the experimental method was confirmed with measurements on pure light water, for which the isochoric heat capacity was measured on the critical isochore (321.96 kg⋅m$^{−3}$) in both the one- and two-phase regions. The result for the phase-transition temperature (the critical temperature, T $_{ C, this work}$=647.104±0.003 K) agreed, within experimental uncertainty, with the critical temperature (T $_{ C, IAPWS}$=647.096 K) adopted by IAPWS.
Starting Page	405
Ending Page	428
Page Count	24
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	24
Issue Number	2
e-ISSN	15729567
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2003-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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