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March 17, 2010, 05:25 |
Diesel substitute
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#1 |
New Member
Join Date: Mar 2010
Posts: 5
Rep Power: 16 |
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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March 17, 2010, 11:55 |
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#2 |
Senior Member
Pauli
Join Date: Mar 2009
Posts: 189
Rep Power: 17 |
In SAE paper 1999-01-0528, the authors show n-heptadecane provides the best liquid length match with DF2 data.
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March 17, 2010, 14:32 |
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#3 |
New Member
Join Date: Mar 2010
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Rep Power: 16 |
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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March 18, 2010, 06:01 |
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#4 |
Super Moderator
Niklas Nordin
Join Date: Mar 2009
Location: Stockholm, Sweden
Posts: 693
Rep Power: 29 |
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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March 18, 2010, 19:19 |
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#5 |
New Member
Join Date: Mar 2010
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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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March 19, 2010, 02:49 |
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#6 |
Super Moderator
Niklas Nordin
Join Date: Mar 2009
Location: Stockholm, Sweden
Posts: 693
Rep Power: 29 |
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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March 22, 2010, 19:06 |
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#7 |
New Member
Join Date: Mar 2010
Posts: 5
Rep Power: 16 |
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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