Estimation of Flammability Limits of Selected Fluorocarbons with F(sub 2) and CIF(sub3) Page: 58 of 78
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boundary data for fluorine and C1F3 reacting with various PFCs and CFCs uses the parameter set
shown in Exhibit B.3. A more conservative set, which adjusts the threshold downward to
account for sparseness of experimental data and apparent system-to-system variability is shown
in Exhibit B.4.
Exhibit B.3. File image of FLAME4D.PRM, showing "best fit" parameter values
Best fit -- Boundary Parameter Set
rich 140.0 800
lean 110.0 1100
Exhibit B.4. File image of FLAME4D.PRM, showing "conservative fit" parameter values
Conservative fit -- Boundary Parameter Set
rich 85.0 900
lean 70.0 1050
The first line can be used as a title or description line. It is ignored by the program except that it
will be repeated in the'output file. The second line must begin with the word "rich" followed by
the "A" and "B" parameter values defining the predicted rich-mixture adiabatic temperature
threshold function. The next line must begin with the word "lean" and contain A and B values
for the lean mixture temperature threshold function. The empirical formula for predicted
adiabatic temperature is of the form
Ti= = Ale, I Xoxidiza + Big
T=ich Aich I S Xftei + Bi h
where X is the mole fraction of the species in question and S is a stoichiometry parameter
(supplied in a later data file), which specifically is the number of moles of oxidizer required to
react the fuel to CF4 (and to C12 if chlorine is present in the fuel or oxidizer). These two
temperatures are combined to yield the single temperature (predicted to be the necessary
"ignition temperature" of the gas mixture) by a smoothing scheme:
Tdareld t= (T Oan + T rich )-14
The relationships given by these formula and parameter values are purely empirical.
3. "Control" file - a text file containing one line with system data, followed by any number of
single lines describing each desired run. The first line of the file contains three numeric values.
Each of these three numbers should be separated by one or more spaces. The first number is the
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Trowbridge, L.D. Estimation of Flammability Limits of Selected Fluorocarbons with F(sub 2) and CIF(sub3), report, September 1, 1999; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc623234/m1/58/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.