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#1 |
Member
Mey
Join Date: Dec 2019
Posts: 99
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Hi everybody,
I simulated the distribution of a multicomponent material with the below mass fraction an exhaust product in the surrounding of a car.: H2O 0.0581 N2 0.72881 O2 0.04528 CO2 0.15833 NO 0.00004 NO2 0.00002 Ar 0.00934 CO 0.00001 CxHy 0.00007 I have set a continous fluid and variable composition mixture. What I see in the reult is that Ar component with less mass fraction(0.0094) reaches a bigger area in comparison with N2 and O2 with mass fractions 0.72881 and 0.04528, respectively. Co2 and Ar are components that are spread to a wide area. I expected that the component with more mass fraction would reach a bigger area. Can anyone explain to me why it happens? regards, Last edited by MNMK; June 4, 2024 at 09:46. |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,816
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I assume this is a diffusion driven thing. Diffusion is driven by concentration gradients, not absolute values of concentrations. So if Ar has diffused further then its concentration gradient is higher. This assumes all the mass fractions have the same diffusion constant, obviously if Ar has a larger diffusion constant then it will diffuse faster.
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