Methane fire

Bido14 · February 2, 2013, 05:20

Please help and advise how to establish a steady fire using methane

msaeedsadeghi · February 3, 2013, 04:20

You can use non-premixed combustion or eddy-dissipation models. In non-premixed mode you should first make a PDF table.

At first you should define if it is a non-premixed flame?

Bido14 · February 3, 2013, 04:34

I think it is not a non premixed.
It is a pipe of methane in the atmosphere.
I have previously used the finite rate/eddy dissipation but couldn't ignite it

msaeedsadeghi · February 3, 2013, 04:40

Is it unsteady?
You can use spark ignition. both reactants, oxidants and products should be avalable at the spark zone.

Bido14 · February 3, 2013, 05:12

I use a steady model, with methane at 1000 K to avoid spark. is that correct?

msaeedsadeghi · February 3, 2013, 06:00

No, You should use a hot spot for initizalization of ignition, like a point with high temperature.

Bido14 · February 3, 2013, 07:14

Can you please clarify what is a hot spot, and how can i make it?
In the case of using it, shall the methane be entered at room temperature and then pass by it to ignite?

February 2, 2013, 05:20	Methane fire	#1
Bido14 New Member Mohamed Join Date: Nov 2012 Posts: 11 Rep Power: 13	Please help and advise how to establish a steady fire using methane

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February 3, 2013, 04:20		#2
msaeedsadeghi Senior Member SSL Join Date: Oct 2012 Posts: 226 Rep Power: 14	You can use non-premixed combustion or eddy-dissipation models. In non-premixed mode you should first make a PDF table. At first you should define if it is a non-premixed flame?

February 3, 2013, 04:34		#3
Bido14 New Member Mohamed Join Date: Nov 2012 Posts: 11 Rep Power: 13	I think it is not a non premixed. It is a pipe of methane in the atmosphere. I have previously used the finite rate/eddy dissipation but couldn't ignite it

February 3, 2013, 04:40		#4
msaeedsadeghi Senior Member SSL Join Date: Oct 2012 Posts: 226 Rep Power: 14	Is it unsteady? You can use spark ignition. both reactants, oxidants and products should be avalable at the spark zone.

February 3, 2013, 05:12		#5
Bido14 New Member Mohamed Join Date: Nov 2012 Posts: 11 Rep Power: 13	I use a steady model, with methane at 1000 K to avoid spark. is that correct?

February 3, 2013, 06:00		#6
msaeedsadeghi Senior Member SSL Join Date: Oct 2012 Posts: 226 Rep Power: 14	No, You should use a hot spot for initizalization of ignition, like a point with high temperature.

February 3, 2013, 07:14		#7
Bido14 New Member Mohamed Join Date: Nov 2012 Posts: 11 Rep Power: 13	Can you please clarify what is a hot spot, and how can i make it? In the case of using it, shall the methane be entered at room temperature and then pass by it to ignite?