Comparison of Unsteady Laminar and DES Solutions of Synthetic Jet Flow

Characterization and Modeling of Synthetic Jet Flow Fields

10.21236/ada433145 ◽

2005 ◽

Author(s):

Paul D. Orkwis ◽

Matteo Pes ◽

Claudio Filz ◽

Terry Daviaux ◽

Katherine Grendell ◽

...

Keyword(s):

Jet Flow ◽

Flow Fields ◽

Synthetic Jet

Analysis of hot-wire anemometry data obtained in a synthetic jet flow

Experimental Thermal and Fluid Science ◽

10.1016/j.expthermflusci.2003.05.001 ◽

2004 ◽

Vol 28 (4) ◽

pp. 265-272 ◽

Cited By ~ 21

Author(s):

S.G. Mallinson ◽

J.A. Reizes ◽

G. Hong ◽

P.S. Westbury

Keyword(s):

Jet Flow ◽

Synthetic Jet ◽

Hot Wire ◽

Hot Wire Anemometry

Experimental Investigation of High-Frequency-Actuation Synthetic Jet Flow Control

52nd Aerospace Sciences Meeting ◽

10.2514/6.2014-0400 ◽

2014 ◽

Cited By ~ 2

Author(s):

Michael Bottomley ◽

Alan Packwood

Keyword(s):

Experimental Investigation ◽

Flow Control ◽

High Frequency ◽

Jet Flow ◽

Synthetic Jet

The performance of round synthetic jets in quiescent flow

The Aeronautical Journal ◽

10.1017/s0001924000001305 ◽

2006 ◽

Vol 110 (1108) ◽

pp. 385-393 ◽

Cited By ~ 26

Author(s):

M. Jabbal ◽

J. Wu ◽

S. Zhong

Keyword(s):

Near Field ◽

Jet Flow ◽

Synthetic Jet ◽

Synthetic Jets ◽

Operating Conditions ◽

Stroke Length ◽

Synthetic Jet Actuators ◽

Macro Scale ◽

Jet Actuators ◽

The Impact

AbstractPIV measurements in the near-field region of a jet flow emanating from a round synthetic jet actuator into quiescent air were conducted over a range of operating conditions. The primary purpose of this work was to investigate the nature of synthetic jets at different operating conditions and to examine the jet flow parameters that dictate the behaviour of synthetic jet actuators. The effects of varying diaphragm displacement and oscillatory frequency for fixed actuator geometry were studied. It was observed that the characteristics of synthetic jets are largely determined by the Reynolds number and stroke length. An increase in the former is observed to increase the strength of consecutive vortex rings that compose a synthetic jet, whereas an increase in the latter results in an increase in relative vortex ring spacing and for further increases in stroke length, shedding of secondary vortices. Correlations were also made between the operating parameters and the performance parameters most effective for flow control and which therefore determine the impact of a synthetic jet on an external flow. Relations of time-averaged dimensionless mass flux, momentum flux and circulation with the jet flow conditions were established and found to widely support an analytical performance prediction model described in this paper. It is anticipated that the experimental data obtained in this study will also contribute towards providing a PIV database for macro-scale synthetic jet actuators.

Study on longitudinal stability improvement of flying wing aircraft based on synthetic jet flow control

Aerospace Science and Technology ◽

10.1016/j.ast.2015.07.022 ◽

2015 ◽

Vol 46 ◽

pp. 287-298 ◽

Cited By ~ 9

Author(s):

Xiaoping Xu ◽

Zhou Zhou

Keyword(s):

Flow Control ◽

Jet Flow ◽

Synthetic Jet ◽

Longitudinal Stability

Introduction to the Synthetic Jet Flow Control and Drag Reduction Techniques

Recent Progress in Flow Control for Practical Flows ◽

10.1007/978-3-319-50568-8_12 ◽

2017 ◽

pp. 223-232

Author(s):

Milan Matejka

Keyword(s):

Drag Reduction ◽

Flow Control ◽

Jet Flow ◽

Synthetic Jet ◽

Reduction Techniques

320 Characteristics of a Jet Flow Generated by a Circular Synthetic Jet Actuator : Comparison with a Circular Jet(2)

The Proceedings of the Fluids engineering conference ◽

10.1299/jsmefed.2007._320-1_ ◽

2007 ◽

Vol 2007 (0) ◽

pp. _320-1_-_320-4_

Author(s):

Toru KOSO ◽

Takuya KINOSHITA

Keyword(s):

Jet Flow ◽

Synthetic Jet ◽

Synthetic Jet Actuator

E15 Characteristics of a Jet Flow generated by a Circular Synthetic Jet Actuator

The Proceedings of Conference of Kyushu Branch ◽

10.1299/jsmekyushu.2007.60.157 ◽

2007 ◽

Vol 2007.60 (0) ◽

pp. 157-158

Author(s):

Takuya KINOSHITA ◽

Toru KOSO

Keyword(s):

Jet Flow ◽

Synthetic Jet ◽

Synthetic Jet Actuator

Synthetic Jet Flow Field Database for CFD Validation

2nd AIAA Flow Control Conference ◽

10.2514/6.2004-2218 ◽

2004 ◽

Cited By ~ 21

Author(s):

Chungsheng Yao ◽

Fang-Jenq Chen ◽

Jerome Harris ◽

Dan Neuhart

Keyword(s):

Flow Field ◽

Jet Flow ◽

Synthetic Jet ◽

Cfd Validation ◽

Field Database

Heat Transfer Enhancement by Synthetic Jet Arrays in Air-Cooled Heat Sinks for Use in Electronics Cooling

Volume 2: Heat Transfer Enhancement for Practical Applications; Fire and Combustion; Multi-Phase Systems; Heat Transfer in Electronic Equipment; Low Temperature Heat Transfer; Computational Heat Transfer ◽

10.1115/ht2012-58278 ◽

2012 ◽

Author(s):

Longzhong Huang ◽

Terrence Simon ◽

Min Zhang ◽

Youmin Yu ◽

Mark North ◽

...

Keyword(s):

Heat Transfer ◽

Heat Transfer Enhancement ◽

Channel Flow ◽

Heat Sink ◽

Jet Flow ◽

Synthetic Jet ◽

Synthetic Jets ◽

Transfer Enhancement ◽

Transfer Coefficients ◽

Heat Transfer Coefficients

A synthetic jet is an intermittent jet which issues through an orifice from a closed cavity over half of an oscillation cycle. Over the other half, the flow is drawn back through the same orifice into the cavity as a sink flow. The flow is driven by an oscillating diaphragm, which is one wall of the cavity. Synthetic jets are widely used for heat transfer enhancement since they are effective in disturbing and thinning thermal boundary layers on surfaces being cooled. They do so by creating an intermittently-impinging flow and by carrying to the hot surface turbulence generated by breakdown of the shear layer at the jet edge. The present study documents experimentally and computationally heat transfer performance of an array of synthetic jets used in a heat sink designed for cooling of electronics. This heat sink is comprised of a series of longitudinal fins which constitute walls of parallel channels. In the present design, the synthetic jet flow impinges on the tips of the fins. In the experiment, one channel of a 20-channel heat sink is tested. A second flow, perpendicular to the jet flow, passes through the channel, drawn by a vacuum system. Surface- and time-averaged heat transfer coefficients for the channel are measured, first with just the channel flow active then with the synthetic jets added. The purpose is to assess heat transfer enhancement realized by the synthetic jets. The multiple synthetic jets are driven by a single diaphragm which, in turn, is activated by a piezoelectrically-driven mechanism. The operating frequency of the jets is 1250 Hz with a cycle-maximum jet velocity of 50 m/s, as measured with a miniature hot-film anemometer probe. In the computational portion of the present paper, diaphragm movement is driven by a piston, simulating the experimental conditions. The flow is computed with a dynamic mesh using the commercial software package ANSYS FLUENT. Computed heat transfer coefficients show a good match with experimental values giving a maximum difference of less than 10%. The effects of amplitude and frequency of the diaphragm motion are documented. Changes in heat transfer due to interactions between the synthetic jet flow and the channel flow are documented in cases of differing channel flow velocities as well as differing jet operating conditions. Heat transfer enhancement obtained by activating the synthetic jets can be as large as 300% when the channel flow is of a low velocity compared to the synthetic jet peak velocity (as low as 4 m/s in the present study).