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mixing two laminar flows of different fluids in the same chamber

Posted 18 juin 2013, 13:58 UTC−4 Fluid & Heat, Computational Fluid Dynamics (CFD), Microfluidics Version 4.2a, Version 4.3b 2 Replies

Jon Pey
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Dear all,

I am trying to mix two laminar flows of different fluids within the same chamber in a very simple geometry. In particular, I have two “inlet pipes” converging into a common chamber with an outlet.

Through the first pipe there is an input flow of water whilst the second pipe introduces methanol in the chamber. In both cases the inlet condition is set as a constant mass flow.

Not sure which physics I have to use as to model this. I have already tried including several laminar flows as well as with multi-phase physics but I was not able to obtain relevant solutions.

Any advice in this regard?

Thanks a lot in advance.
2 Replies Last Post 13 oct. 2013, 21:30 UTC−4
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David Pelt
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Posted: 1 decade ago 10 oct. 2013, 06:23 UTC−4
I have the same problem. I could not find a similar tutorial which involves mixing two different fluids.

I have done several tutorials about mixing, including static mixers, but those tutorials only work with one fluid (water).

It can be as simple as taking a T-joint ending in a pipe or even a static mixer

Thanks in advance
I have the same problem. I could not find a similar tutorial which involves mixing two different fluids. I have done several tutorials about mixing, including static mixers, but those tutorials only work with one fluid (water). It can be as simple as taking a T-joint ending in a pipe or even a static mixer Thanks in advance
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 13 oct. 2013, 21:30 UTC−4
Dear David,

Look up the multiphase flow COMSOL gallery examples like the Inkjet Nozzle. Even though it’s a single inlet problem the settings should be quite similar to what you need. For fluid mixing problems always watch out for artificial diffusion which could can easily be mistaken for good fluid mixing.

Nagi Elabbasi
Veryst Engineering
Dear David, Look up the multiphase flow COMSOL gallery examples like the Inkjet Nozzle. Even though it’s a single inlet problem the settings should be quite similar to what you need. For fluid mixing problems always watch out for artificial diffusion which could can easily be mistaken for good fluid mixing. Nagi Elabbasi Veryst Engineering

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