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Droplet breakup in a T-Junction in a smaller channel

Topics: Geometry, Solving, Mesh, 3.5a, MEMS, Fluid Flow, Microfluidics

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February 5, 2012 12:09am UTC

Droplet breakup in a T-Junction in a smaller channel

Hi all,

I have a specific set of parameters for wich I am trying to simulate the breakup of droplets in a T-junction. Entering these parameters for the geometry from the example MEMS module[1] gives fine results (droplets form).
However, if I slash the channel size in half (50x50x20 mum) I get no droplets but a coflow regime, where the dispersed phase occupies the upper part of the channel.
Now I have a real life system that has exactly the same dimensions (50x50x20 mum) and I can generate droplets for the same set of parameters in that.
So, I am somewhat stumped on how to proceed from here. I tried doubling the meshsize and increased the timeframe of the simulation and even fiddled around with the parameters, but it always gives me the cowflow regime.

Any help appreciated.

[1] The geometry in the example module is a 100x100x50 mum channel.

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