Full text loading...
Schematic of the experimental setup. The flexible tubing directing the inner fluid into the capillary microfluidic device is connected to a mechanical vibrator that induces controlled pressure variation at the entrance of the inner capillary.
Different flow regimes as a function of the frequency of the forcing. The inner and outer fluid flow rates are, respectively, Qin = 50 μl h−1 and Qout = 5000 μl h−1. Optical image of the jets and drops observed (a) in the absence of external forcing, f = 0 Hz, (b) at f = 3 Hz, (c) f = 4 Hz, (d) f = 6 Hz, (e) f = 7 Hz, (f) f = 8 Hz, and (g) f = 10 Hz (scale bars are 200 μm) (see Ref. 20). A state diagram of the different regimes as a function of the frequency of the forcing (in Hz) and the input voltage applied to the mechanical vibrator (in volts, left scale) is represented in (h). The dashed-dotted line is the growth rate of the Rayleigh-Plateau instability (right scale) (see Ref. 22) (enhanced online). [URL: http://dx.doi.org/10.1063/1.3702434.1] [URL: http://dx.doi.org/10.1063/1.3702434.2] [URL: http://dx.doi.org/10.1063/1.3702434.3] [URL: http://dx.doi.org/10.1063/1.3702434.4] [URL: http://dx.doi.org/10.1063/1.3702434.5] [URL: http://dx.doi.org/10.1063/1.3702434.6] [URL: http://dx.doi.org/10.1063/1.3702434.7] [URL: http://dx.doi.org/10.1063/1.3702434.8]10.1063/1.3702434.110.1063/1.3702434.210.1063/1.3702434.310.1063/1.3702434.410.1063/1.3702434.510.1063/1.3702434.610.1063/1.3702434.710.1063/1.3702434.8
Diameter of the droplets as a function of the perturbation frequency for inner and outer fluid flow rates of Qin = 50 μl h−1 and Qout = 5000 μl h−1 respectively. The black dashed line is the scaling law. Experimental diameters of the generated drop are indicated by the red circles.
(a) Schematic of the setup for the generation of double emulsion. (b) w/w/w double emulsion, the size of the inner droplets as well as their numbers can be controlled by varying the frequency of excitation and the flow rates. Scale bar is 100 μm.
Article metrics loading...