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fireFOAM: reactions file setup

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Old   March 14, 2017, 11:15
Default fireFOAM: reactions file setup
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Ashish Vinayak
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Hi,

I'm reopening this issue of what irreversibleArrheniusSolidReaction means with regard to fireFOAM pyrolysis modelling. I have pretty much looked everywhere including the source code and I still don't know what this means. A further complication thus results, which is, I cannot include the model parameters since they really don't exist anywhere. How can I be sure that the pyrolysis model even works ? I hope someone knows what's going on?

The following reactions file is included with the fireFOAM/LES/simplePMMApanel/constant/panelRegion.


species
(
PMMA
);
gaseousSpecies
(
gas
);
reactions
{
charReaction
{
type irreversibleArrheniusSolidReaction;
reaction "PMMA = gas";
A 1.2e6; // what is this value
Ta 11300.57; // what is this value
Tcrit 400; // what is this value
}
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Old   July 5, 2017, 07:44
Default Solution
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Ashish Vinayak
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For anyone who comes looks for this, I found the answer:

Reaction rate is computed based on an Arrhenius Equation, that is set up as follows:

RR = A* exp(-Ta/Tcrit)

where Ta = Ea/R.
A -> pre-exponential factor
Ea -> Activation Energy
R -> Ideal Gas constant.
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Old   August 14, 2017, 07:55
Default fireFoam
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Hello, can i ask you some things about fireFoam? I'm trying to simulate a fire in a closed place, but I have doubts.
Thank you, thank you, Luca.
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Old   August 14, 2017, 09:09
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Ashish Vinayak
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Quote:
Originally Posted by luca1992 View Post
Hello, can i ask you some things about fireFoam? I'm trying to simulate a fire in a closed place, but I have doubts.
Thank you, thank you, Luca.
I'll help you as much as I can
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Old   August 14, 2017, 11:08
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Hi, thanks very much for the reply, I also asked for help in another forum discussion (both in "fireFOAM: reactions file setup" and in "HRR in fireFoam") and now I do not know what to do. I did not know if anyone answered me since July 30 I had created a post but no one answered me and so I was not very optimistic and so I had written on both posts that had the latest message in 2017, now I could write my question on both of the discussions, but maybe it would be better to unify them, do you know how to do it? Maybe it's better if I publicize my question in my previous post "Simulating fire in a tunnel" so if you can answer me there. Thank you both (Roman1 and ashish.vinayak) let me know if it is all right for you.
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arrhenius, firefoam, pmma, pyrolysis

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