Tables of Thermodynamic Properties of Air in Chemical Equilibrium

Tables of Thermodynamic Properties of Air in Chemical Equilibrium PDF

Author: Joseph Hilsenrath

Publisher:

Published: 1965

Total Pages: 364

ISBN-13:

DOWNLOAD EBOOK →

Tables for the thermodynamic properties for air are presented which take into account the effect of dissociation and ionization and the limiting-law Debye-Huckel and second virial corrections upon the thermodynamic properties and the equilibrium compositions. Values are tabulated from 1500K in steps of 100K to 15,000K at close spacings in the logarithm of the density (log rho/rho sub o = -7. (0.2)2.2) for the compressibility factor Z Z = PV/RT; the dimensionless functions for: internal energy, E/RT; enthalpy, H/RT; entropy, S/R Xi; log P(atm) and Z = sigma C sub i. The underlying equations and the input data are discussed briefly. The effects of the real gas corrections on the equilibrium properties are illustrated graphically. The equilibrium composition is given for selected temperatures over the tabulated density range. The wide range of temperatures and densities over which the thermodynamic properties have been tabulated make the tables useful in a variety of engineering design and test programs, and in scientific research and development.

Approximations for the Thermodynamic and Transport Properties of High-temperature Air

Approximations for the Thermodynamic and Transport Properties of High-temperature Air PDF

Author: C. Frederick Hansen

Publisher:

Published: 1958

Total Pages: 724

ISBN-13:

DOWNLOAD EBOOK →

The thermodynamic and transport prorerties of high-temperature air are found in closed form starting from approximate partition functions for the major components in air and neglecting all minor components. The compressibility, energy, entropy, the specific heats, the speed of sound, the coefficients of viscosity and of thermal conductivity, and the Prandtl numbers for air are tabulated from 500 degrees to 15,000 degrees K over a range of pressure from 0.0001 to 100 atmospheres. The enthalpy of air and the mol fractions of the major components of air can easily be found from the tabulated values for compressibility and energy. It is predicted that the Prandtl number for fully ionized air will become small compared to unity, the order of 0.01, and this implies that boundary layers in such flow will be very transparent to heat flux.

Calculations and Curve Fits of Thermodynamic and Transport Properties for Equilibrium Air to 30000 K

Calculations and Curve Fits of Thermodynamic and Transport Properties for Equilibrium Air to 30000 K PDF

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-07-06

Total Pages: 82

ISBN-13: 9781722292836

DOWNLOAD EBOOK →

A self-consistent set of equilibrium air values were computed for enthalpy, total specific heat at constant pressure, compressibility factor, viscosity, total thermal conductivity, and total Prandtl number from 500 to 30,000 K over a range of 10(exp -4) atm to 10(exp 2) atm. The mixture values are calculated from the transport and thermodynamic properties of the individual species provided in a recent study by the authors. The concentrations of the individual species, required in the mixture relations, are obtained from a free energy minimization calculation procedure. Present calculations are based on an 11-species air model. For pressures less than 10(exp -2) atm and temperatures of about 15,000 K and greater, the concentrations of N(++) and O(++) become important, and consequently, they are included in the calculations determining the various properties. The computed properties are curve fitted as a function of temperature at a constant value of pressure. These curve fits reproduce the computed values within 5 percent for the entire temperature range considered here at specific pressures and provide an efficient means for computing the flowfield properties of equilibrium air, provided the elemental composition remains constant at 0.24 for oxygen and 0.76 for nitrogen by mass. Gupta, Roop N. and Lee, Kam-Pui and Thompson, Richard A. and Yos, Jerrold M. Langley Research Center...

Lanterna Rally - Theme by Grace Themes