wall surface reaction constant

Diger · July 23, 2016, 12:23

So maybe a stupid question but specifically about this I didn't find anything in the manual:
Is the meaning of the rate constant for wall surface reactions the same as for the usual volumetric reactions just that it only applies to cells directly at the wall or is the meaning completely different as well as the magnitude or even different units?

Diger · July 24, 2016, 09:11

So the only thing that fluent mentions is:
https://www.sharcnet.ca/Software/Flu...ug/node613.htm

But is the site species [S] in kmol/m2 or kmol/m3
Also the gas species [G]? Is it here in kmol/m3 or reevaluated on the surface at the boundary so in kmol/m2 ???
The final rate is apparently in kmol/m2/s therefore if [S] is in kmol/m2 and [G] is in kmol/m3 then the rate konstant [k]=m3/kmol/s (for a bimolecular surface reaction)
But this somehow is not intuitive (since it is NOT a volumetric reaction but a surface reaction). I would expect the rate constant to be m2/kmol/s which would imply [G]=kmol/m2, but this is nowhere specified...
Some clarification would be nice :-(

July 23, 2016, 12:23	wall surface reaction constant	#1
Diger Senior Member Join Date: Nov 2015 Posts: 135 Rep Power: 10	So maybe a stupid question but specifically about this I didn't find anything in the manual: Is the meaning of the rate constant for wall surface reactions the same as for the usual volumetric reactions just that it only applies to cells directly at the wall or is the meaning completely different as well as the magnitude or even different units?

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July 24, 2016, 09:11		#2
Diger Senior Member Join Date: Nov 2015 Posts: 135 Rep Power: 10	So the only thing that fluent mentions is: https://www.sharcnet.ca/Software/Flu...ug/node613.htm But is the site species [S] in kmol/m2 or kmol/m3 Also the gas species [G]? Is it here in kmol/m3 or reevaluated on the surface at the boundary so in kmol/m2 ??? The final rate is apparently in kmol/m2/s therefore if [S] is in kmol/m2 and [G] is in kmol/m3 then the rate konstant [k]=m3/kmol/s (for a bimolecular surface reaction) But this somehow is not intuitive (since it is NOT a volumetric reaction but a surface reaction). I would expect the rate constant to be m2/kmol/s which would imply [G]=kmol/m2, but this is nowhere specified... Some clarification would be nice :-(