NDLI: Experimental study on flow and heat transfer characteristics of synthetic jet driven by piezoelectric actuator

Content Provider	Springer Nature Link
Author	Zhang, JingZhou Tan, XiaoMing
Copyright Year	2007
Abstract	To investigate the flow and heat transfer characteristics of a synthetic jet driven by piezoelectric actuator, experimental investigation utilizing particle image velocimetry, hot-wire anemometer and infrared camera was carried out. The results show that: (1) At the jet orifice exit, pairs of vortexes are generated, broken down and merged together periodically, forming a steady jet within a several slot width from distance near the orifice exit. And during the development, the synthetic jet spreads rapidly along the minor axis direction of the orifice. While along the major axis direction, the synthetic jet contracts firstly and then spreads slowly. (2) Excitation frequency forced on the actuator has a great effect on the synthetic jet flow field. There are two resonance frequencies at which the mean velocity and vorticity of the synthetic jet are maximized, especially at the higher resonance frequency. The resonance frequency values obtained by the experiment are lower than the theoretical values. (3) Similarly to the common jet impingement, the convective heat transfer coefficients at the target surface impinged by the synthetic jet also take on up-down tendency varying with the jet-to-surface spacing increment. But the jet-to-surface spacing ratio for optimum cooling achievement is greater and the cooling action region is wider than the former, indicating that the synthetic jet introduces a stronger entrainment and more vigorous penetration in the surrounding fluid.
Starting Page	221
Ending Page	229
Page Count	9
File Format	PDF
ISSN	10069321
Journal	Science in China Series E: Technological Sciences
Volume Number	50
Issue Number	2
e-ISSN	1862281X
Language	English
Publisher	Science in China Press
Publisher Date	2007-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	synthetic jet impinging cooling flow heat transfer Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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