How to specify a mixture of gases at inlet boundary condition?

Matlab69 · April 22, 2012, 14:16

Hi guys,

I am trying to specify at inlet boundary conidtions that I have a mixture of gases entering the domain - x kg/s of methane and y kg/s of air, for example. However, I am only able to choose one gas for the inlet...

vagaikwa · April 22, 2012, 23:29

is it possible for you to split your inlet in two parts? so that you can enter both the fluid velocities.

Andrea1984 · April 24, 2012, 05:17

Hi,

I'm not sure about this, but if you're using the VOF model, you should be able to specify the volume fraction of each phase at the inlet (if you have a velocity inlet, velocity is the same for the two phases so knowing the different densities you should be able to specify the flow rate).
Hope this can help,

Andrea

delaneyluke · April 24, 2012, 06:08

There are 2 ways. If it's a homogeneous mixture (no discrete phases) you can use the species transport model and define your mixture with mass fractions of individual components.
If it's a inhomogeneous mixture (discrete phases) then you can either use the Multiphase-->Mixture model or Multiphase-->VOF model and define the volume/mass fractions of your 2 phases at the inlet.

Regards
Luke

April 22, 2012, 14:16	How to specify a mixture of gases at inlet boundary condition?	#1
Matlab69 New Member Andrius Join Date: Mar 2012 Posts: 23 Rep Power: 14	Hi guys, I am trying to specify at inlet boundary conidtions that I have a mixture of gases entering the domain - x kg/s of methane and y kg/s of air, for example. However, I am only able to choose one gas for the inlet...

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April 22, 2012, 23:29		#2
vagaikwa Member Join Date: Apr 2012 Posts: 48 Rep Power: 14	is it possible for you to split your inlet in two parts? so that you can enter both the fluid velocities.

April 24, 2012, 05:17		#3
Andrea1984 Senior Member Andrea Join Date: Feb 2012 Location: Leeds, UK Posts: 179 Rep Power: 16	Hi, I'm not sure about this, but if you're using the VOF model, you should be able to specify the volume fraction of each phase at the inlet (if you have a velocity inlet, velocity is the same for the two phases so knowing the different densities you should be able to specify the flow rate). Hope this can help, Andrea

April 24, 2012, 06:08		#4
delaneyluke Senior Member Join Date: Mar 2009 Location: Indiana, US Posts: 186 Rep Power: 17	There are 2 ways. If it's a homogeneous mixture (no discrete phases) you can use the species transport model and define your mixture with mass fractions of individual components. If it's a inhomogeneous mixture (discrete phases) then you can either use the Multiphase-->Mixture model or Multiphase-->VOF model and define the volume/mass fractions of your 2 phases at the inlet. Regards Luke