ethane.fld

一个关于物性计算的软件

?\
!end of info section
90.352             !lower temperature limit [K]
625.0              !upper temperature limit [K]
70000.             !upper pressure limit [kPa]
22.419             !maximum density [mol/L]
3   0              !# terms for dilute gas function:  numerator, denominator
245.0   1.d-3      !reducing parameters for T, tcx
1.7104147                0.0           !coeff, power in T
-0.6936482              -1.0
0.                     -96.0
7   0              !# terms for background gas function:  numerator, denominator
305.33    6.87    4.41786d-3    !reducing parameters for T, rho, tcx
 0.96084322   0.0    1.0   0.0  !coeff, powers of t, rho, exp(rho)
 2.7500235    0.0    2.0   0.0
-0.026609289  0.0    3.0   0.0
-0.078146729  0.0    4.0   0.0
 0.21881339   0.0    5.0   0.0
 2.3849563   -1.5    1.0   0.0
-0.75113971  -1.0    3.0   0.0
TK3                !pointer to critical enhancement auxiliary function


#AUX               !thermal conductivity critical enhancement model
TK3  thermal conductivity critical enhancement of Friend et al. (1991).
?LITERATURE REFERENCE \
?Friend, D.G., Ingham, H., and Ely, J.F.,
? "Thermophysical properties of ethane,"
? J. Phys. Chem. Ref. Data, 20(2):275-347, 1991.
?\
!end of info section
20.0               !lower temperature limit [K]
2000.0             !upper temperature limit [K]
2200000.0          !upper pressure limit [kPa]
46.99              !maximum density [mol/L]
9  0  0  0         !# terms:  terms, spare, spare, spare
1.0    1.0  1.0    !reducing par for T, rho, tcx (mW/m-K)
0.630d0            !gnu (universal exponent)
1.242d0            !gamma (universal exponent)
1.01d0             !R0 (universal amplitude)
 0.065d0           !z (universal exponent--not used for t.c., only viscosity)
 1.00d0            !c (constant in viscosity eqn = 1/[2 - (alpha + gamma)/(2*nu)], but often set to 1)
0.19d-9            !xi0 (amplitude) [m]
0.0563             !gam0 (amplitude) [-]
0.545d-9           !qd_inverse (modified effective cutoff parameter) [m]
610.66             !tref (reference temperature) [K]


#ETA               !viscosity model specification
VS1  pure fluid viscosity model of Friend et al. (1991).
?LITERATURE REFERENCE \
?Friend, D.G., Ingham, H., and Ely, J.F.,
? "Thermophysical properties of ethane,"
? J. Phys. Chem. Ref. Data, 20(2):275-347, 1991.
?\
?The uncertainty in viscosity is 2%.
?\
!end of info section
90.352             !lower temperature limit [K]
625.0              !upper temperature limit [K]
70000.             !upper pressure limit [kPa]
22.419             !maximum density [mol/L]
1                  !number of terms associated with dilute-gas function
CI2                !pointer to reduced effective collision cross-section model
0.43682            !Lennard-Jones coefficient sigma [nm]
245.0              !Lennard-Jones coefficient epsilon/kappa [K]
1.0    1.0         !reducing parameters for T, eta
0.1463897  0.50d0  !Chapman-Enskog term
0                  !number of terms for initial density dependence
0 0 9 3 0 0        !# resid terms:  close-packed density;  simple poly; numerator of rational poly; denominator of rat. poly; numerator of exponential; denominator of exponential
305.33    6.87       15.977         !reducing parameters for T, rho, eta
 0.47177003   0.0    1.00  0.00  0   !simple polynomial terms
-0.23950311  -1.0    1.00  0.00  0
 0.39808301   0.0    2.00  0.00  0
-0.27343335  -1.0    2.00  0.00  0
 0.35192260  -1.5    2.00  0.00  0
-0.21101308   0.0    3.00  0.00  0
-0.00478579  -2.0    3.00  0.00  0
 0.07378129   0.0    4.00  0.00  0
-0.030425255 -1.0    4.00  0.00  0
 1.           0.0    0.00  0.00  0
-0.30435286   0.0    1.00  0.00  0
 0.001215675 -1.0    1.00  0.00  0
NUL                !pointer to critical enhancement auxiliary function (none used)


@ETA               !viscosity model specification
VS2  pure fluid viscosity model of Younglove and Ely (1987).
?LITERATURE REFERENCE \
?Younglove, B.A. and Ely, J.F.,
? "Thermophysical properties of fluids. II. Methane, ethane, propane,
? isobutane and normal butane,"
? J. Phys. Chem. Ref. Data, 16:577-798, 1987.
?\
?N.B.  all temperatures on IPTS-68
?\
?The uncertainty in viscosity is 2%, except in the critical region which is 5%.
?\
!end of info section
90.348             !lower temperature limit [K]
600.0              !upper temperature limit [K]
70000.0            !upper pressure limit [kPa]
22.419             !maximum density [mol/L]
CI2                !pointer to collision integral model
0.440110           !Lennard-Jones coefficient sigma [nm]
240.0              !Lennard-Jones coefficient epsilon/kappa [K]
  1.46388493d-01   !const in Eq 19 = 5/16*(k*MW/1000/pi/Na)**0.5*1.0d12
 0.5               !exponent in Eq 19 for T
 0.2102436247d+01  !coeff for initial density dependence of viscosity (eq 21); Fv(1)
-0.1065920192d+01  !Fv(2)
 1.4               !Fv(3)
 305.33            !Fv(4)
-0.1903481042d+02  !coefficients for residual viscosity, eqs (22 - 25)
 0.1799260494d+04  !Ev(2)
 0.1561316986d+02  !Ev(3)
-0.1497221136d+05  !Ev(4)
 0.1130374601d+00  !Ev(5)
-0.2186440756d+02  !Ev(6)
 0.8235954037d+04  !Ev(7)
 6.875             !Ev(8)
NUL                !pointer to critical enhancement auxiliary function (none used)


#AUX               !collision integral specification
CI2  collision integral model of M. Klein et al (1974).
?LITERATURE REFERENCE \
?Klein, M., Hanley, H.J.M., Smith, F.J., and Holland, P.,
? Natl. Bur. Stand. (U.S.), Monograph 47, 1974.
?\
?also repeated in:
?Friend, D.G., Ingham, H., and Ely, J.F.,
? "Thermophysical properties of ethane,"
? J. Phys. Chem. Ref. Data, 20(2):275-347, 1991.
?\
?and
?\
?Younglove, B.A. and Ely, J.F.,
? "Thermophysical properties of fluids. II. Methane, ethane, propane,
? isobutane and normal butane,"
? J. Phys. Chem. Ref. Data, 16:577-798, 1987.
?(but note that there is an error in the Younglove and Ely paper)
?\
!end of info section
90.352             !lower temperature limit [K]
625.0              !upper temperature limit [K]
0.0                !(dummy) upper pressure limit
0.0                !(dummy) maximum density
9                  !number of terms
 -3.0328138281     !Omega: coeffs of {(e/kT)**((i-1)/3 - 1)}
 16.918880086
-37.189364917
 41.288861858
-24.61592114
  8.948843096
 -1.8739245042
  0.209661014      !N.B.  wrong sign in Younglove and Ely, Table 2
 -0.009657044


@TRN               !transport model specification
ECS  Extended Corresponding States model (Nitrogen reference); predictive mode.
?LITERATURE REFERENCES \
?Klein, S.A., McLinden, M.O., and Laesecke, A.,
? "An improved extended corresponding states method for estimation of
? viscosity of pure refrigerants and mixtures,"
? Int. J. Refrigeration, 20:208-217, 1997.
?\
?McLinden, M.O., Klein, S.A., and Perkins, R.A.,
? "An extended corresponding states model for the thermal conductivity
? of refrigerants and refrigerant mixtures,"
? Int. J. Refrigeration, 23:43-63, 2000.
?\
?the Lennard-Jones parameters are taken from:
?\
?Reid, R.C., Prausnitz, J.M., and Poling, B.E.,
? "The Properties of Gases and Liquids,"
? 4th edition, New York, McGraw-Hill Book Company, 1987.
?\
!end of info section
90.348             !lower temperature limit [K]
600.0              !upper temperature limit [K]
70000.0            !upper pressure limit [kPa]
22.419             !maximum density [mol/L]
FEQ Nitrogen.fld
VS1                !model for reference fluid viscosity
TC1                !model for reference fluid thermal conductivity
1                  !Lennard-Jones flag (0 or 1) (0 => use estimates)
0.4443             !Lennard-Jones coefficient sigma [nm] for ECS method
215.7              !Lennard-Jones coefficient epsilon/kappa [K] for ECS method
1  0  0                       !number of terms in f_int term in Eucken correlation, spare1, spare2
 1.3200d-3   0.0   0.0   0.0  !coeff, power of T, spare 1, spare 2
1  0  0                       !number of terms in psi (visc shape factor): poly,spare1,spare2
 1.0000d+0   0.0   0.0   0.0  !coeff, power of Tr, power of Dr, spare
1  0  0                       !number of terms in chi (t.c. shape factor): poly,spare1,spare2
 1.0000d+0   0.0   0.0   0.0  !coeff, power of Tr, power of Dr, spare


#STN        !surface tension specification
ST1  surface tension model; fit of data from Soares (1986), Leadbetter (1964), and Katz (1939).
?LITERATURE REFERENCE \
?fit of the data of:
?\
?Soares, V.A.M., Almeida, B.J.V.S., McLure, I.A., and Higgins, R.A.,
? "Surface tension of pure and mixed simple substances at low temperature,"
? Fluid Phase Equilibria, 32:9-16, 1986.
?\
?Leadbetter, A.J., Taylor, D.J., and Vincent, B.,
? "The densities and surface tension of liquid ethane and nitrous oxide,"
? Can. J. Chem., 42:2930-2932, 1964.
?\
?Katz, D.L. and Saltman, W.,
? "Surface tension of hydrocarbons,"
? Ind. Eng. Chem., 31:91-94, 1939.
?\
!end of info section
90.348             !lower temperature limit [K]
305.34             !upper temperature limit [K]
0.0                !(dummy) upper pressure limit
0.0                !(dummy) maximum density
2                           !number of terms in surface tension model
305.34                      !critical temperature used in fit (dummy)
 0.05378     1.26           !sigma0 and n
-0.007008    2.52


#DE         !dielectric constant specification
DE1  dielectric constant model of Younglove and Ely (1987).
?LITERATURE REFERENCE \
?Younglove, B.A. and Ely, J.F.,
? "Thermophysical properties of fluids. II. Methane, ethane, propane,
? isobutane and normal butane,"
? J. Phys. Chem. Ref. Data, 16:577-798, 1987.
?\
?The uncertainty in dielectric constant is 0.05%.
?\
!end of info section
83.80              !lower temperature limit [K]
150.6633           !upper temperature limit [K]
0.0                !(dummy) upper pressure limit
0.0                !(dummy) maximum density
305.34  1.0  1.0   !reducing parameters for t, d, and p
4 1 0 0 0 0                         !number of terms in dielectric constant model
    0.111421d-1   0.    1.    0.    !coef, t exp, d exp, p exp
    0.206622d-4   0.    2.    0.
   -0.135982d-5   0.    3.    0.
   -0.145683d-6   0.    1.    1.
    0.630432d-4   0.    1.    0.


#MLT        !melting line specification
ML1  melting line model of Younglove and Ely (1987).
?LITERATURE REFERENCE \
?Younglove, B.A. and Ely, J.F.,
? "Thermophysical properties of fluids. II. Methane, ethane, propane,
? isobutane and normal butane,"
? J. Phys. Chem. Ref. Data, 16:577-798, 1987.
?\
!end of info section
90.352             !lower temperature limit [K]
625.0              !upper temperature limit [K]
0.0                !(dummy) upper pressure limit
0.0                !(dummy) maximum density
1.       1000.     !reducing temperature and pressure
2 0 0 0 0 0                 !number of terms in melting line equation
-255.98971357786 0.         !coefficients and exponents (extra digits required
 0.1400342d-1    2.179      !to achieve ptp=1.13 Pa)


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