A Rational Equation of State for Water and Water Vapor in the Critical Region

1964 ◽  
Vol 86 (3) ◽  
pp. 320-326 ◽  
Author(s):  
E. S. Nowak
Keyword(s):  
Water Vapor ◽  
Equation Of State ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Critical Point ◽  
Critical Region ◽  
Constant Pressure ◽  
Parametric Equation ◽  
Enthalpy And Entropy ◽  
Specific Volumes

A parametric equation of state was derived for water and water vapor in the critical region from experimental P-V-T data. It is valid in that part of the critical region encompassed by pressures from 3000 to 4000 psia, specific volumes from 0.0400 to 0.1100 ft3/lb, and temperatures from 698 to 752 deg F. The equation of state satisfies all of the known conditions at the critical point. It also satisfies the conditions along certain of the boundaries which probably separate “supercritical liquid” from “supercritical vapor.” The equation of state, though quite simple in form, is probably superior to any equation heretofore derived for water and water vapor in the critical region. Specifically, the deviations between the measured and computed values of pressure in the large majority of the cases were within three parts in one thousand. This coincides approximately with the overall uncertainty in P-V-T measurements. In view of these factors, the author recommends that the equation be used to derive values for such thermodynamic properties as specific heat at constant pressure, enthalpy, and entropy in the critical region.

scholarly journals Specific heat and gap structure of a nematic superconductor: Application to FeSe

2021 ◽  
Vol 104 (9) ◽  
Author(s):  
Kazi Ranjibul Islam ◽  
Jakob Böker ◽  
Ilya M. Eremin ◽  
Andrey V. Chubukov
Keyword(s):  
Specific Heat ◽  
Gap Structure

scholarly journals Gap structure of FeSe determined by angle-resolved specific heat measurements in applied rotating magnetic field

2017 ◽  
Vol 96 (22) ◽  
Author(s):  
Yue Sun ◽  
Shunichiro Kittaka ◽  
Shota Nakamura ◽  
Toshiro Sakakibara ◽  
Koki Irie ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Specific Heat ◽  
Rotating Magnetic Field ◽  
Gap Structure

THERMODYNAMICS OF q-MODIFIED BOSONS

1996 ◽  
Vol 10 (06) ◽  
pp. 683-699 ◽  
Author(s):  
P. NARAYANA SWAMY
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Equation Of State ◽  
Partition Function ◽  
Statistical Mechanics ◽  
Specific Heat ◽  
Thermodynamic Functions ◽  
Bose Condensation ◽  
Grand Partition Function ◽  
Statistical Mechanical

Based on a recent study of the statistical mechanical properties of the q-modified boson oscillators, we develop the statistical mechanics of the q-modified boson gas, in particular the Grand Partition Function. We derive the various thermodynamic functions for the q-boson gas including the entropy, pressure and specific heat. We demonstrate that the gas exhibits a phase transition analogous to ordinary bose condensation. We derive the equation of state and develop the virial expansion for the equation of state. Several interesting properties of the q-boson gas are derived and compared with those of the ordinary boson which may point to the physical relevance of such systems.

Thermodynamic Properties of five Halogenated Hydrocarbon Vapour Power Cycle Working Fluids

1973 ◽  
Vol 15 (2) ◽  
pp. 132-143 ◽  
Author(s):  
B. M. Burnside
Keyword(s):  
Equation Of State ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Halogenated Hydrocarbons ◽  
Sonic Velocity ◽  
Simulation Studies ◽  
Computer Design ◽  
Working Fluids ◽  
Power Cycle ◽  
Halogenated Hydrocarbon

Thermodynamic properties of five halogenated hydrocarbons, of importance as working fluids for small vapour power units, have been studied. The compounds are monochlorobenzene, hexafluorobenzene, o-dichlorobenzene, perfluoro-2-butyltetrahydrofuran and perfluorodecalin. With the aid of the Martin-Hou equation of state the properties of each compound, including sonic velocities and specific heat ratios, have been correlated. By comparison with the well established data for steam the accuracy of the sonic velocity and specific heat ratio values has been indicated. The information is presented in a manner which facilitates either the production of saturation and superheat tables or diagrams, or direct inclusion of the data in computer design and simulation studies of Rankine plant.

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