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What type of model specific UDF needed for executing reduction process

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Old   December 27, 2017, 06:15
Thumbs up What type of model specific UDF needed for executing reduction process
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There is a furnace in which a small porous layer exists at the bottom. Combustion is happening in the furnace and co co2 and temperature are developed which are used for the reduction process to happen in the botom porous layer and accordingly variation of co and co2 as well as temperature will come inside the furnace.

The reduction part inside the porous medium has to be incorporated as a UDF

UDF-EXPLANATION

Iron oxide reductions
3Fe2O3 + CO = 2Fe3O4 + CO2
Fe3O4 + CO = 3FeO + CO2
FeO + CO = Fe + CO2

carbon gasification (HIGHLY ENDOTHERMIC)
CO2 + C = 2CO

The reduction of iron ore coal composite pellet proceeds by the formation of the intermediate oxides evolution, which includes the following steps, i.e. hematite first gets converted to the magnetite then from there to wustite and finally iron and all these reduction happens by the regeneration of CO through carbon gasification equation

First order kinetics has been used for the reduction equation. details of rate eq is given n file attached.

R=(4*phi*r^2)exp(E/RT)(CONCco-(CONCco2/T)) for iron ore reduction, where CONCco is the concentration of co etc. like wise for carbon gasification as well.

i have written a udf using DEFINE_SOURCE but no variation in CO and CO2 concentration was observed.

What type of model specific UDF should be used for executing reduction process such that mutual interaction between combustion and radiation will be there inside the furnace.

like
DEFINE_VR_RATE
DEFINE_EXCHANGE_PROPERTY
DEFINE_SOURCE............itself
I AM TOTALLY CONFUSED.kindly help me out
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Old   December 28, 2017, 07:39
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kINDLY REPLY SOMEONE, its been a month ..............thanks in advance!

Last edited by sooraj546; January 17, 2018 at 23:47. Reason: no response till now
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Old   January 1, 2018, 09:56
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kINDLY REPLY SOMEONE..............thanks in advance!
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Old   January 18, 2018, 01:51
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Hello everyone
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combustion model, fluent - udf, species transport model, udf and programming

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