The thermodynamic properties of slush hydrogen and oxygen

Abstract

The thermodynamic properties of hydrogen and oxygen have been calculated for temperatures both below and above the triple point. Values of the various physical properties required for the computations are either taken from the literature, or are extrapolated. If extrapolated, the extrapolations are based on the known behavior of other simple fluids. The results are presented in the form of computer programs which cover two regions of the phase diagram, solid-vapor, and solid-liquid. Input to the programs is temperature and quality. The properties returned include pressure, density, enthalpy, entropy and internal energy. The present programs for slush hydrogen and slush oxygen are an extension of and depend upon the equations of state developed previously for these gases.

Calculation of intermolecular potentials for H 2 H 2 and H 2 O 2 dimers ab initio and prediction of second virial coefficients

“…The result agrees reasonably well with the ab initio prediction. The sublimation pressure of γ-oxygen, which is required for the equilibrium calculation, was taken from the work of Roder [40]. -In an earlier publication on high-pressure phase equilibria of the (hydrogen + oxygen) system it had been suggested that the parameters of the hydrogen-oxygen interaction could be interpolated from those of the systems (hydrogen + nitrogen), (neon + nitrogen), and (neon + oxygen) [41].…”

Prognosis and Numerical Analysis of the Pressure Drop in Slush Hydrogen Vacuum-Jacketed Transfer Lines

“…The latter is going to be used in the phase-change modeling. Properties such as viscosity, density, molar weight, thermal conductivity, thermal expansivity, and reference state enthalpies were found in Reynier and Bugel (2011) and Roder (1977) and introduced into the materials section, respectively, for solid and liquid hydrogen. The fluid or solid regions are called domains in CFX; a fluid domain is created and located at the region inside the inner pipe along the whole line.…”

Guide: Guide to Safety of Hydrogen and Hydrogen Systems (AIAA G-095-2004)

“…• Potential toxic air contaminants Roder 1977 c P = pressure d atm = atmosphere (1 atm = 101.325 kPa) e T = Temperature f V = specific volume (V = 1/D) g D = density h H = enthalpy i S = entropy j U = internal energy k Csat = specific heat at saturated solid l Cp = specific heat at constant pressure m ∆Hsub = enthalpy difference for sublimation Ahlers 1963 i H = enthalpy j (cal/mol) x 2.0755 = J/g k S = entropy l Csat = specific heat of saturated solid m ∆Hsub = enthalpy difference for sublimation n Z = compressibility factor (dimensionless) Coward and Jones do not provide a specific value, but state that the normal variation of room temperatures have no effect on flammability limits. The location of GH2 storage, as determined by the maximum total quantity of GH2, shall be in the order of preference indicated by Roman numerals with I indicating the most preferred and IV the least preferred location.…”