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oxygen gas surface reaction and the product diffusion into the block

Posted 30 mars 2015, 20:50 UTC−4 Chemical Reaction Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 5.0 2 Replies

Feng Song
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there is an boundary condition question on the process of oxygen gas surface reaction and the product diffusion into the block.

oxygen gas reacts with the metal on the metal surface, and the productof metal oxide diffuse into the metal block.
I'm not sure the flux boundary condition.
J=reaction rate or J=reaction rate - dcs/dt, cs is the concentration of metal oxide in the surface of metal.
which one of boundary condition is right for the process?

2 Replies Last Post 31 mars 2015, 06:30 UTC−4
Lasse Murtomäki
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Posted: 10 years ago 31 mars 2015, 01:32 UTC−4
Hi

For oxygen the boundary condition is J = -reaction rate, minus sign because oxygen is consumed. For the metal oxide the BC is J = +reaction rate, because it is produced.

BR
Lasse
Hi For oxygen the boundary condition is J = -reaction rate, minus sign because oxygen is consumed. For the metal oxide the BC is J = +reaction rate, because it is produced. BR Lasse
Feng Song
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Posted: 10 years ago 31 mars 2015, 06:30 UTC−4
thanks a lot
thanks a lot

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