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Old   March 17, 2010, 05:25
Default Diesel substitute
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sbu
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Hi,

I want to simulate the breakup of diesel droplets and therefore I'm searching for a diesel substitute. Bescause I only focus on breakup, the relevant properties for me are density, viscosity and surface tension.

I already checked the source files of several liquids, but I don't understand how the properties are definded.

Which liquid should I use or can sombody explain me how to find out myself?
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Old   March 17, 2010, 11:55
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In SAE paper 1999-01-0528, the authors show n-heptadecane provides the best liquid length match with DF2 data.
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Old   March 17, 2010, 14:32
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Hi Pauli, thanks a lot for your answer.

Heptadecance seems to fit quite well here. But the problem is that my droplet temperature should be 293 K, which is a few degrees below the meltingpoint of C17H36.

Further more, heptadecane is not implemented in OF, so that I will probably use hexadecane or tetradecane. I found out that their properties are almost equal to the ones of my diesel (rho=831Kg/m^3, sigma=0.026kg/s^2, mu=0.0023Pas).

However, I still don't know how to compare these values to the ones in OF, just to be sure. I'm looking forward to some help.

Thanks, sbu
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Old   March 18, 2010, 06:01
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Here's a small utility I use from time to time.
It might be helpful

http://files.nequam.se/liquidProp.tgz

unpack it
go to the liquidProp directory and run 'wmake'
go to the example directory and edit your fuel in constant/thermophysicalProperties

run 'liquidProp -T 350' and it will calculate the density at 350 K.

Add additional info statements in liquidProp.C if you want, it should be obvious how to do it.
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Old   March 18, 2010, 19:19
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Thank you very much, Mr. Nordin. That program works well.

But I've got a new problem now. I've chosen c14h30 as liquid in the thermophysicalProperties file, but I found out that it is not listed in the thermo.dat list.

I haven't found out much about the thermo.dat file and chemkin readers yet, but I hope that there is a way (which is not too difficult) to add c14h30 to the list.

I would be happy about some support.

Thanks in advance, sbu.
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Old   March 19, 2010, 02:49
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google 'burcat' or go here directly

http://garfield.chem.elte.hu/Burcat/THERM.DAT

just copy/paste the c4h30 stuff into the therm.dat.

as for the chemistry part, you have to figure that out yourself.
If you want to start with just a global reaction being converted to co2 and h2o,
that should be straightforward to just modify the coefficients for the existing c7h16 example.
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Old   March 22, 2010, 19:06
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Thank you very much again, Mr. Nordin.

That information helped me a lot, although I couldn't add the c14h30 data to the therm.dat file correctly. I hope to solve this problem soon.

Sincerely yours, sbu.
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