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define a fast reaction in pre

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Old   March 9, 2006, 17:11
Default define a fast reaction in pre
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Gab
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Hi, all

In a problem I am dealing with, there is a chemical species A, which can react with another compound B(which already in water)immediately after injecting to water.

Can someone suggest how to deal with such a fast reaction. The reaction of A is in first order kinetics, however it may be not possible to use a source term to model it because of very samll time scale.

Thanks!

Best regards!

Gab

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