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:
Click to download in FLV format (590.29kB)
Regime: dropping (wetting)
The separation of th red fluid is even simpler if the interaction with the wall is wetting:
Click to download in FLV format (758.91kB)
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:
Click to download in FLV format (561.24kB)
Regime: wall attachement
Similarly, the mechanism of the flow-focusing device fails if the flow of blue fluid is too weak:
Click to download in FLV format (556.98kB)
