chemical reaction in Fluent involving gaseous reactants and solid product

sara137 · June 21, 2020, 05:03

I am simulating a system involving four successive chemical reactions. Three reactions are involving gas to gas transformations. The last one has gaseous reactant and forms a solid and a gaseous product. The solid is in a powder form. I am using species transport as species model with volumetric reactions. I defined my solid as a fluid with solid proprieties. Can it model this reaction properly?

vinerm · June 21, 2020, 17:20

If you model solid as fluid, then Fluent would expect required properties, since it has to solve Navier-Stokes equation for that fluid. You have to use DPM (would require UDF for nucleation to form particles) or Population Balance Model. If the concentration of the resulting particles is very less and the fluid properties could be considered as averaged properties, then you don't need to model heterogeneous reactions or nucleation. You can modify the fluid properties in the cells where solid is formed. You still have to use UDF for that.

sara137 · June 26, 2020, 06:06

Hello, thank you Vinerm for your response. The concentration of solid particle is less than 10% (volume), so I don't need to model heterogeneous reaction?
Regarding DPM, does it need an injection? because the solid is a reaction product, and I can’t specify where would it be produced (X-position, Y-position, X-velocity etc...)

June 21, 2020, 05:03	chemical reaction in Fluent involving gaseous reactants and solid product	#1
sara137 New Member sara Join Date: Jun 2020 Posts: 11 Rep Power: 6	I am simulating a system involving four successive chemical reactions. Three reactions are involving gas to gas transformations. The last one has gaseous reactant and forms a solid and a gaseous product. The solid is in a powder form. I am using species transport as species model with volumetric reactions. I defined my solid as a fluid with solid proprieties. Can it model this reaction properly? Last edited by sara137; June 21, 2020 at 09:13.

June 21, 2020, 17:20	Solid as Fluid	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	If you model solid as fluid, then Fluent would expect required properties, since it has to solve Navier-Stokes equation for that fluid. You have to use DPM (would require UDF for nucleation to form particles) or Population Balance Model. If the concentration of the resulting particles is very less and the fluid properties could be considered as averaged properties, then you don't need to model heterogeneous reactions or nucleation. You can modify the fluid properties in the cells where solid is formed. You still have to use UDF for that. soheil_r7 and sara137 like this. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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June 26, 2020, 06:06		#3
sara137 New Member sara Join Date: Jun 2020 Posts: 11 Rep Power: 6	Hello, thank you Vinerm for your response. The concentration of solid particle is less than 10% (volume), so I don't need to model heterogeneous reaction? Regarding DPM, does it need an injection? because the solid is a reaction product, and I can’t specify where would it be produced (X-position, Y-position, X-velocity etc...)