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udf for partical surface reaction

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Old   April 25, 2011, 08:24
Default udf for partical surface reaction
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I'm trying to use the Eulerian granular model to simulate the combustion of solid carbon and I've just started with a simple case and found that the rate of surface reaction needs to be defined using udf and the reaction is c(s) + o2 > co2. but I don't know how to write a udf so I appreciate anyone who can help me in doing so.

many thanks and your corporation is highly appreciated.
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