argon.c File Reference

Argon thermodynamic functions. More...

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "../../util/source/compiler.h"
#include "../../util/source/useful.h"
#include "argon.h"

Defines
#define	R0   8.3140
#define	MW_Ar   40.0
#define	MW_N2   28.0
#define	R_Ar   (R0 / MW_Ar * 1000.0)
#define	R_N2   (R0 / MW_N2 * 1000.0)
#define	WARNINGS   0
#define	DEBUG_ARGON   0
#define	RIZKALLA   1
#define	T_MAX   80000.0
#define	NS   4
#define	Ar   0
#define	Arp   1
#define	em   2
#define	N2   3
#define	p0   101325.0
#define	TOL   0.001
Functions
int	argon_er (double e, double rho, double f_Ar, double f_N2, int use_T_guess, double *p, double *a, double *T)
int	argon_e_from_T (double rho_mix, double T, double f_Ar, double f_N2, double *e_mix, double *h_mix, double sigma[])
int	argon_init (void)
Variables
double	arg_G_RT [NS]
double	arg_H_RT [NS]
double	arg_S_R [NS]
double	arg_a [NS][8][5]
int	argon_initialized

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Detailed Description

Argon thermodynamic functions.

To provide reasonably fast equation-of-state routines for argon gas at temperatures high enough to cause ionisation. A diluent D is also included as part of the gas mixture. It has been assumed that the diluent is *inert* nitrogen.

Author:

Peter Jacobs

Version:

1.0 : 11-Mar-97 : basic code

1.1 : 16-Mar-97 : code adapted from n2eq.c

1.2 : 20-Mar-97 : adjust Rizkalla's coefficients to have Tref = 0 K

1.3 : 21-Mar-97 : add a 4th range to Rizkalla polynomials replace range 3 for argon atoms and N2

1.4 : 22-Mar-97 : improved the initial guess for T

2.0 : 13-Apr-97 : optional initial guess for T

3.0 : 16-May-97 : rename all global varaibles to avoid conflict with the variables from other modules (n2eq.c)

Reference...

R. K. Prabhu & W. D. Erickson (1988) A rapid method for the computation of equilibrium chemical composition of air to 15000 K. NASA Technical Paper 2792

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