Hey, I am trying to solve gas mixture problem in comsol. I need to start inflow with one inlet, and I have gas mixture, two immiscible gas. And flow must be on one inlet through to one outlet. I looked for 2 phase models but I could not find any supporting tuturial. After that, I tried to solve this problem with multiphysics coupling. Laminar flow and transport concentrated species(TCS). But I dont guess that, It can help. Because I couldnt add two gasses into one domain. Also, TCS has 2 component but I have mixture velocity so how can I do this study ?
Hi,
If I understand your question, you need to define two gases in one domain using laminar flow and transport of concentrated species (TCS)?
Based on the diffusion model you selected, once you set up transport properties such as mixture molar masses and diffusion coefficients, these values will be automatically assigned for your single domain which means that your domain is a mixture. By default, number of species is 2 and you can increase this number if you have more from 'Dependent variables' under TCS module node.
Regards,
Thank you. It solved my problem. Also, I wonder that can I see the molar fractions according to molar fraction of component 2 (which was added as second component at Inflow). After solving the problem, I can examine the molar fractions or volume fractions but I am not sure that they are exact. I have 1 tcs for 1 domain. This TCS has the main component and other component.
Hi Semih,
Since you have two components of the mixture, say A and B and you already defined one of them as a mass constraint (found in species under TCS node), say you selected component A, then only component B will be available at 'inflow boundary condition' in terms of mass fraction or mole fraction because you already accounted component A as a constraint.
Regards,
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