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Old   April 22, 2016, 06:09
Unhappy Porous Media Model reaction mechanism
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Hello everyone,

I am trying to model turbulent combustion flow in a packed bed of limestone. This packed bed of limestone has been modeled using Porous Media Model. The zone is selected as Fluid and the material as solid CaCO3. Energy equation is turned on. The velocity inlet of fuel and air is form the top. The reactions of the Porous boundary has also been turned on, however the limestone reaction mechanism has not been entered and i am not sure if i could also model the limestone decomposition reaction along with heat and mass transfer. My question is in order to include the decomposition reactions along with heat and mass transfer of solid material caco3 ,do i need multi-phase modeling approach? As currently, all the flow is assumed as gaseous.
or how or in what way could i add the limestone decomposition reactions? Do i need to add source terms in the porous boundary layer?
I am really uncertain and would really appreciate if someone could give an insight to my problem. Any advise or guidance would be highly appreciated.

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Old   July 2, 2016, 08:23
Default help for modeling a vertical shaft lime kiln
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hello umairjamali

I have your problem in modeling. did you succeed to model turbulent combustion flow in a lime kiln? my fuel is natural gas (90% ch4). I am considered a packed bed of limestone using porous media mode, also. i am considered two kinetics reactions for one reaction is ch4 and o2 and other reaction is decomposition of caco3 based on finite rate/eddy dissipation. but after several iteration, velocity magnitude in system achieves very large values about of 84000 m/s and floating error massage shows. I don't know what should I do? is my approach true? are my velocity inlets in gases inlet (air&ch4) wrong? please guide me,
regards
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gaseous reaction, multiphase flow, porous media, reacting flows, turbulent combustion

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