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-   -   dieselFoam (liquid C7H16) (http://www.cfd-online.com/Forums/openfoam/81328-dieselfoam-liquid-c7h16.html)

N. A. October 23, 2010 14:48

dieselFoam (liquid C7H16)
 
Hello All,

I have q eustion about setup of thermo-physical properties file for dieselFOAM solver.

The fuel C7H16 is for liquid drop, which evaporates and mixes with the surrounging air. When it evaproates it is in vapor phase and not liquid phase. But in thermophysicalPorperties file, we specify C7H16 as liquid component as below.

DOes that mean that it will C7H16 as liquid when it is solving gas-phase reaction. I just want to confirm. If not then why do specifiy C7H16 as liquid in thermophysicalProperties file?

Thanks,
Nir

niklas October 23, 2010 15:01

The answer is yes... and no....It does what you tell it.
If you want it to evaporate to heptane it does that,
if you want it to evaporate into water you can do that.
It would be a bit weird, but its possible.
But since you havent specified your input file I dont know what it does.

Anyways, I've tried to describe it on these pages
http://openfoamwiki.net/index.php/Co...icalProperties

N. A. October 23, 2010 18:30

So as I understand C7H16 is considered as gas phase species in the gas phase reaction and the liquid properties is only considered during calculation of diesel droplet energy equation.

The chemkin input file is as belows (as given in the tutorial) and C7H16 is considered as the gaseous species (i.e. gaseous properties of C7H16 is considered),


ELEMENTS
H O C N AR
END
SPECIE
C7H16 O2 N2 CO H2O
O CO2 OH H H2
HO2 H2O2 N NO C
END
REACTIONS
C7H16 + 11O2 => 7CO2 + 8H2O 1.00E+8 0.0 15780.0! 1
FORD / C7H16 0.25 /
FORD / O2 1.5 /
CO + O + M = CO2 + M 6.170E+14 0.00 3000. ! 96
CO + OH = CO2 + H 3.510E+07 1.30 -758. ! 97
CO + O2 = CO2 + O 1.600E+13 0.00 41000. ! 98
HO2 + CO = CO2 + OH 5.800E+13 0.00 22930. ! 99
!
H2 + O2 = OH + OH 1.700E+13 0.00 47780. !100
H2 + OH = H2O + H 1.170E+09 1.30 3626. !101
O + OH = O2 + H 4.000E+14 -0.50 0. !102
O + H2 = OH + H 5.060E+04 2.67 6290. !103
H + HO2 = O + H2O 3.100E+10 0.00 3590. !104
O + OH + M = HO2 + M 1.000E+16 0.00 0. !105
H2O/6.0/ CO2/5.0/ H2/3.3/ CO/2.0/ N2/0.70/
H + O2 + M = HO2 + M 2.800E+18 -.86 0.0!106
O2/0.00/ H2O/ .00/ CO/0.75/ CO2/1.50/ N2/0.0/
H + O2 + O2 = HO2 + O2 2.080E+19 -1.24 0.0!107
H + O2 + H2O = HO2 + H2O 11.26E+18 -.76 0.0!108
H + O2 + N2 = HO2 + N2 2.600E+19 -1.24 0.0!109
OH + HO2 = H2O + O2 7.500E+12 0.00 0. !110
H + HO2 = OH + OH 1.700E+14 0.0 875. !111
O + HO2 = O2 + OH 1.400E+13 0.00 1073. !112
OH + OH = O + H2O 6.000E+08 1.30 0. !113
H + H + M = H2 + M 1.000E+18 -1.00 0. !114
H2/0./ H2O/0./ CO2/0./
H + H + H2 = H2 + H2 9.200E+16 -0.60 0. !115
H + H + H2O = H2 + H2O 6.000E+19 -1.25 0. !116
H + H + CO2 = H2 + CO2 5.490E+20 -2.00 0. !117
H + OH + M = H2O + M 1.600E+22 -2.00 0. !118
H + O + M = OH + M 6.200E+16 -0.60 0. !119
O + O + M = O2 + M 1.890E+13 0.00 -1788. !120
H + HO2 = H2 + O2 1.250E+13 0.00 0. !121
HO2 + HO2 = H2O2 + O2 2.000E+12 0.00 0. !122
OH + OH (+M) = H2O2 (+M) 7.600E+13 -.37 0. !123
LOW / 4.300E+18 -.900 -1700.00/
TROE/ .7346 94.00 1756.00 5182.00 /
H2/2.00/ H2O/6.00/ CO/1.50/ CO2/2.00/ N2/0.70/
H2O2 + H = HO2 + H2 1.600E+12 0.00 3800. !124
H2O2 + OH = H2O + HO2 1.000E+13 0.00 1800. !125
H2O2 + H = H2O + OH 1.000E+13 0.00 3590. !126
H2O2 + O = H2O + O2 8.400E+11 0.00 4260. !127
H2O2 + O = OH + HO2 2.000E+13 0.00 5900. !128
H2 + HO2 = H2O + OH 6.500E+11 0.00 18800. !129
!
CO2 + N = NO + CO 1.900E+11 0.00 3400. !130
N + NO = N2 + O 3.270E+12 0.30 0. !136
N + O2 = NO + O 6.400E+09 1.00 6280. !137
N + OH = NO + H 7.333E+13 0.00 1120. !138
!
END


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