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April 25, 2013, 12:00
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Low Pressure Surface Coverage
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#1 |
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New Member
Natali
Join Date: Apr 2013
Posts: 21
Rep Power: 13  |
Hello guys,
I am recently start working with FLUENT, but I have been working for 10 years in chemistry and combustion. So, this question that I am asking relates just to the FLUENT manipulation. I am simulating combustion in low pressure. So, surface coverage is low in that pressure that seems reasonable. However, its low rate value in FLUENT doesn't make sense. In fact, FLUENT doesn't have progress in that after some iterations and the surface coverage remains unchanged. Do you have any suggestion how to get rid of that? I am entering some coverage-dependent reaction parameters but it doesn't work. I really appreciate if you help me since I am so stuck on that  Thanks, Natali |
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April 25, 2013, 19:46
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#2 |
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New Member
Natali
Join Date: Apr 2013
Posts: 21
Rep Power: 13 |
Hey Guys,
I am really praying somebody helps me from this annoying problem. Thanks, Natali |
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April 26, 2013, 14:32
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#3 |
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New Member
Natali
Join Date: Apr 2013
Posts: 21
Rep Power: 13 |
Any Help?
I am really in problem. |
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April 26, 2013, 14:39
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#4 |
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Member
Parisa
Join Date: Feb 2013
Posts: 51
Rep Power: 13 |
Hey Natali,
There is an option in the surface chemistry as coverage dependent reaction. Did you check that? By default, its values are zero. maybe you want to change them to a realistic value. Did you check the Knudsen number in your problem? Be careful that the knudsen number not become very high, say 0.1 Parisa |
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April 26, 2013, 14:50
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#5 |
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New Member
Natali
Join Date: Apr 2013
Posts: 21
Rep Power: 13 |
Thanks Parisa,
Yes, I tried that too. However, it doesn't work although at the beginning just a little bit more progress in coverage is seen, but it will be stopped. the Knudsen number is in the range of continuum approach. So it shouldn't have any problem. I am really confused and exhausted about this problem. Natali |
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April 26, 2013, 14:56
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#6 |
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Member
Parisa
Join Date: Feb 2013
Posts: 51
Rep Power: 13 |
So, do you have any estimate about the real times or values?
The reactions reach to equilibrium soon in low pressure and maybe you get correct results. Idk |
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April 26, 2013, 15:16
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#7 |
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New Member
Natali
Join Date: Apr 2013
Posts: 21
Rep Power: 13 |
I don't have exact values to compare.
But I know that the surface coverage should keep changing. |
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April 26, 2013, 15:21
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#8 |
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Member
Parisa
Join Date: Feb 2013
Posts: 51
Rep Power: 13 |
Can you send me your case?
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April 26, 2013, 15:23
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#9 |
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Member
Parisa
Join Date: Feb 2013
Posts: 51
Rep Power: 13 |
I sent you already my Email.
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April 26, 2013, 15:26
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#10 |
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New Member
Natali
Join Date: Apr 2013
Posts: 21
Rep Power: 13 |
Check your Email, please.
Thanks, Natali |
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April 28, 2013, 02:19
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#11 |
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New Member
Natali
Join Date: Apr 2013
Posts: 21
Rep Power: 13 |
Hello guys,
I am seriously praying somebody can help me to solve this issue. This seems very annoying and boring. Thanks, Natali |
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