Simulating Microfluidic Flux with COMSOL: Choosing the Right Flow Regime

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Hi everybody! first of all congratulations for the forum, you have very interesting things here! This is the first time that I write a question, and I would be soooo pleased if anyone could help me.

I am working with COMSOL multiphysics program, and I am trying to simulate the flux inside a microchanel that connects a microchamber and then exits through another microchanel. The problem itself is not complicated, but fluids is not my field and I am a bit lost with that... What I would like to know is which kind o flux regime I have to use (Stokes flow, laminar flow, non compresible flow, and so on...)
Thanks to eerybody in advance!
 
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Hi,

I know this is not an answer, only a question but my grad thesis subject is microflowmeter design in Comsol Multiphysics, I am at the beginning now. Could you please share your experiences about incompressible flows in Comsol? Or could you say me any literature and sources?

Many thanks from now.