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Thread: Looking for basic theory on mixing of gases

  1. #1 Looking for basic theory on mixing of gases 
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    Hi,


    In my situation, I am dealing with two ideal gases traveling down a pipe at the same bulk velocities. I am only considering a 1-D treatment at the moment and I would like to find out at which point the two gases should be considered a well mixed, homogeneous mixture. Would anyone know either the particular formulation or even the subject matter to consult to determine the well-mixing of gases?


    Thanks and regards.


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    Bullshit Intolerant PhDemon's Avatar
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    It is the area of fluid dynamics (https://en.m.wikipedia.org/wiki/Fluid_dynamics) and the mixing time will depend on whether the flow is turbulent or laminar. It's been about 20 years since I've used this stuff and I'm a bit rusty but I think I may have some equations I derived for turbulent mixing in my PhD thesis. I'll check tomorrow


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    Bullshit Intolerant PhDemon's Avatar
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    OK, had a look at my thesis and for laminar flow the time for diffusional mixing of a gas flowing into air that is also flowing down the tube is

    t=r^2/5D

    Where r is the radius of the tube and D is the diffusion coefficient of the gas into air. This may not be exactly what you need but it will give an approximate answer
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