Characterization of the microfluidic oscillator

被引:91
作者
Gregory, James W.
Sullivan, John P.
Raghu, Surya
机构
[1] IIT, Dept Mech Mat & Aerosp Engn, Chicago, IL 60616 USA
[2] Adv Fluid Corp, Ellicott City, MD 21042 USA
[3] Purdue Univ, Sch Aeronaut & Astronaut, W Lafayette, IN 47907 USA
基金
美国国家航空航天局;
关键词
D O I
10.2514/1.26127
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
The microfluidic oscillator is a new microscale actuator developed for flow control applications. These patented devices can produce a 325-mu m-wide oscillating gas jet at high frequencies (over 22 kHz) and very low flow rates (similar to 1 l/min or similar to 1 g/min). Furthermore, microfluidic oscillators have no moving parts; the jet oscillations depend solely on the internal fluid dynamics. In this work, the flowfield of a microfluidic oscillator is characterized using pressure transducers, water visualization, and pressure-sensitive paint. The acoustic field and frequency spectrum were characterized for the oscillator: at several. flow rates. The results indicate that the external flowfield of the microfluidic oscillator is marked by two distinct operating regimes, separated by a transitional increase in turbulent noise. This work also demonstrates a significant advance in pressure-sensitive paint technology. New instrumentation was developed to resolve small-scale, time-resolved measurements of a high-frequency micro flowfield. A macro imaging system was used to provide a spatial resolution of approximately 3 mm per pixel and time-resolved, full-unsteady pressure measurements at oscillation frequencies up to 21 kHz.
引用
收藏
页码:568 / 576
页数:9
相关论文
共 57 条
[51]  
Spyropoulos CE., 1964, P FLUID AMPL S, P27
[52]  
Stouffer R.D., 1985, U.S. Patent, Patent No. [4,508,267, 4508267]
[53]  
TEDUKA N, 2000, P 31 JSASS ANN M, P218
[54]   FLIP-FLOP JET NOZZLE [J].
VIETS, H .
AIAA JOURNAL, 1975, 13 (10) :1375-1379
[55]   Fluidic pressure pulse transmitting flowmeter [J].
Wang, H ;
Beck, SBM ;
Priestman, GH ;
Boucher, RF .
CHEMICAL ENGINEERING RESEARCH & DESIGN, 1997, 75 (A4) :381-391
[56]   Direct excitation of small-scale motions in free shear flows [J].
Wiltse, JM ;
Glezer, A .
PHYSICS OF FLUIDS, 1998, 10 (08) :2026-2036
[57]   MANIPULATION OF FREE SHEAR FLOWS USING PIEZOELECTRIC ACTUATORS [J].
WILTSE, JM ;
GLEZER, A .
JOURNAL OF FLUID MECHANICS, 1993, 249 :261-285