Defining a mixture in dpm gasification modelling

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  • Last Post 15 February 2019
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murarz posted this 15 February 2019

Hello everyone! 

I have some doubts regarding the mixture species definition. The user guide says, that the last species in the mixture
(Setup->Materials->Mixture) should be the bulk species. But when I introduce mainly oxygen at the inlet and coal with some small amount of an inert gas (Ar) to transport coal, then after the combustion reaction (C+O2->CO2) I obtain mostly carbon dioxide. So the question is, which element should be my bulk species? (Whereas in air gasification, nitrogen is the most abundant species) in oxygen case at first oxygen is the most abundant element, then it is CO2. So the idea of the bulk species refers to which phase of the process?

Food for thought for me 

Thank you in advance!

 

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abenhadj posted this 15 February 2019

The one which is abundant. If this is not really straightforward select one which does not react. It is just to build up mass fraction corrections.

Best regards,

Amine

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murarz posted this 15 February 2019

Thanks, so it doesn't have to be the most abundant after all. I took it very seriously

abenhadj posted this 15 February 2019

Please mark this as resolved.

Best regards,

Amine

murarz posted this 15 February 2019

I am sorry, but setting different species as the last species, changes results tremendously. (I tried CO, H2O, Ar) and results differ. CO is the most abundant species at the outlet, but not at the inlet. At the inlet O2 among gases is the most abundant species.

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