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Isochoric Heat Capacity of Heavy Water at Subcritical and Supercritical Conditions



B A. Mursalov, Ilmutdin Abdulagatov, V I. Dvoryanchikov, A N. Kamalov, S B. Kiselev


The heat capacity of heavy water was measured in the temperature range from 294 to 746 K and at densities between 52 and 1105 kgm-3 using a high-temperature, high-pressure adiabatic calorimeter. The measurements were performed at 14 liquid and 9 vapor isochores; namely: 52, 74, 107, 170, 219, 261, 303, 338, 345, 370, 400, 493, 668, 784, 833, 883, 926, 958, 1008, 1017, 1064, 1095, and 1105 kgm-3. Uncertainties of the measurments are estimated to be within +or-} 2-3% for vapor isochores and +or-} 1-1.5% for the liquid isochores. In the region of the immediate vicinity of the critical point (0.97 less than or equal to}T/Tcless than or equal to}1.03 and 0.75less than or equal to}p/pcless than or equal to}1.25), the uncertainty in meaurement is +or-}4-4.5%. The original Cv data were corrected and converted to the new ITS-90 temperature scale. The parametric crossover equation of state was used to represent the isochoric hear capacity meaurements of heavy water in the extended critical region, 0.8less than or equal to}T/Tcless than or equal to}1.5 and 0.35less than or equal to}p/pcless than or equal to}1.65. The liquid and vapor one-and two-phase isochoric heat capacities, tempertures, and stauration densities were extracted from experimental data for each measured isochore. Most of the expermental data are compared with the Kestin and Sengers equation of state and overall statistics of deviation between experimental data and the equation of state are given.
International Journal of Thermophysics
No. 5


coexistance curve, critical point, crossover equation of state, heavy water, isochoric heat capacity, water


Mursalov, B. , Abdulagatov, I. , Dvoryanchikov, V. , Kamalov, A. and Kiselev, S. (1999), Isochoric Heat Capacity of Heavy Water at Subcritical and Supercritical Conditions, International Journal of Thermophysics (Accessed May 20, 2024)


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Created August 31, 1999, Updated October 12, 2021