Characterization of a Micro Fluidic Oscillator for Flow Control

§The fluidic oscillator is a new micro-scale actuator developed for flow control applications. These patented devices can produce a 325-μ μ μ μm wide oscillating jet at high frequencies (over 22 kHz) and very low flow rates (~1 L/min or ~1 g/min). Furthermore, micro fluidic oscillators have no moving parts ‐ the jet oscillations depend solely on the internal fluid dynamics. In this work, the flowfield of a micro fluidic oscillator is characterized using pressure transducers, water visualization, and pressure-sensitive paint (PSP). The acoustic field and frequency spectrum were characterized for the oscillator at several flow rates. Recent advances in porous pressure-sensitive paint technology have enabled measurements of micro-scale flows, as well as at very high frequencies. A macro imaging system was used to provide a spatial resolution of approximately 3-μm per pixel. Porous pressure-sensitive paint allows time-resolved, full-unsteady pressure measurements. Full-field PSP images were acquired of the micro fluidic oscillator flow at oscillation frequencies up to 21 kHz. **

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