Regime: dropping (non-wetting)

The mechanism of a flow-focusing device is illustrated in the following example, in which the red fluid has a non-wetting interaction with the wall:

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Regime: dropping (wetting)

The separation of th red fluid is even simpler if the interaction with the wall is wetting:

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Regime: threading

If the lateral flow of the blue fluid is too strong, the red fluid does not separate, and instead forms a constant thread:

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Regime: wall attachement

Similarly, the mechanism of the flow-focusing device fails if the flow of blue fluid is too weak:

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