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bjcfd March 29, 2010 13:18

combusting particle definition
 
Hi! I have a quick question about defining combusting particles in the DPM model. If wet combustion is turned on, when defining the material properties of combustion particles, should the fractions of volatiles/combustibles on dry basis or wet basis? And the devolatilization temperature, should it be the water boiling point temperature or the temperature for the onset of particle devolatilization reaction?

Thanks in advance!

sega March 29, 2010 16:26

Quote:

Originally Posted by bjcfd (Post 252160)
should the fractions of volatiles/combustibles on dry basis or wet basis?

You would suppose (meaning I don't know for sure) that is should be based on wet conditions...

bjcfd March 30, 2010 13:27

Many thanks for the reply. Any more comments on this?

made July 19, 2012 05:37

modelling combustion fluel
 
Hai everybody, i have problem how to modeling temperature combustion biomass fuel using fluidized bed? Please help me

a.m. July 20, 2012 05:02

Quote:

Originally Posted by bjcfd (Post 252160)
Hi! I have a quick question about defining combusting particles in the DPM model. If wet combustion is turned on, when defining the material properties of combustion particles, should the fractions of volatiles/combustibles on dry basis or wet basis? And the devolatilization temperature, should it be the water boiling point temperature or the temperature for the onset of particle devolatilization reaction?

Thanks in advance!

If wet combustion is turned on, you should use volatiles/combustibles on dry basis. please see eq. 16-134 Fluent Theory guide. Liquid fraction (in wet combustion tab) should be defined as volume fraction, volatiles/combustibles (in materials tab) - as mass fraction.
If you hesitate, check the mass balances.

Regards a.m.


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