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What does the check box "locked concentration/activity" for?

Posted 8 oct. 2016, 23:13 UTC−4 Chemical Reaction Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 5.1 0 Replies

Yang Xiang
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The help file explains that, select the Locked concentration/activity check box if the species concentration or activity should be treated as constant. But in the tutorial "chem.thermal_decomposition", I noticed that they locked the concentration of species F (the only production in the reaction).

1.Why cF should be treated as constant in this case?
2.Then I cancel the lock, and added a new dependent variable cF in the Transport of Diluted Species interface, repeated the compute procedure, and I got a similar plot of cA as before. But when I plotted the distribution of cF, the result shows that cF equals 0 in any area. It really confused me.

I am fresh in COMSOL and English, so sorry for my mistakes. I'm waiting for your explanation, thanks for you time!
0 Replies Last Post 8 oct. 2016, 23:13 UTC−4
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Hello Yang Xiang

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