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(a) Schematic of size control drop maker; the valve control channels are indicated by the black arrows; the device is tall and the nozzle is in width. Photomicrographs of size control device with (b) valve unactuated so that large drops are produced, (c) valve actuated so that small drops are produced, and (d) over a cyclical range of valve actuations; flow rates are for the dispersed and continuous phases. (e) Schematic of frequency control drop maker with valve edges indicated by black arrows; the device is tall and in width. Photomicrographs of frequency control devices with (f) valves unactuated so that drops are produced slowly, (g) valves actuated so that drops are produced more quickly, and (h) valves actuated over a cyclical range; flow rates are for the dispersed phase and for the continuous phase. Scale bars for all figures denote .
Raw time traces of the valve actuation signal (upper orange curve) and fluorescent drop signal (lower green curve with spikes); each spike corresponds to a drop flowing past the optical detector.
Response functions of (a) drop size as a function of orifice width and (b) drop production frequency as a function of side channel width . (c) Drop size distributions for different valve actuations; the inset shows the optically measured width of the orifice as a function of the pressure applied to the valve. (d) Drop production frequency distributions for three valve actuations.
Time traces of (a) orifice width and drop diameter and (b) side channel width and drop frequency. Power spectra of time traces for (c) orifice width and drop diameter and (d) side channel width and drop frequency.
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