The current study allows the recognition of the most optimal combination of excitation frequency, kind of orifice, and synthetic jet-to-surface spacing in order to obtain the fastest cooling time using a Taguchi experimental design. To this end, the heat transfer and synthetic jet velocity behavior using different kinds of orifices are obtained experimentally. A piezoelectric diaphragm has been selected as a vibrating actuator. Four kinds of orifices have been studied: circular, rectangular, triangular, and square. First, the study consists of recognizing the excitation frequency in which each orifice produces the highest flow velocity. A hotwire anemometer has been used in order to measure the synthetic jet velocity. Additionally, a steel plate has been heated and then cooled using the synthetic jet set at the excitation frequency in which the jet velocity was the largest for each orifice. For the statistical analysis, the input study variables are the type of orifice and jet-to-surface spacing. The output variable has been the cooling time. The results show that using a combination of a rectangle orifice, 20 mm of jet-to-surface spacing and an excitation frequency of 2000 Hz, it is obtained the fastest cooling time. In addition, using these parameters, a mean heat transfer coefficient of 11.05 (W/m2K) with a coefficient of performance (COP) of 49.21 has been obtained. Finally, for each kind of orifice, there is the presence of two resonant frequencies, the Helmholtz (acoustic resonance) frequency and piezoelectric diaphragm natural frequency.

References

References
1.
Mangate
,
L. D.
, and
Chaudhari
,
M. B.
,
2016
, “
Experimental Study on Heat Transfer Characteristics of a Heat Sink With Multiple-Orifice Synthetic Jet
,”
Int. J. Heat Mass Transfer
,
103
, pp.
1181
1190
.
2.
Tan
,
X. M.
, and
Zhang
,
J. Z.
,
2013
, “
Flow and Heat Transfer Characteristics Under Synthetic Jets Impingement Driven by Piezoelectric Actuator
,”
Exp. Therm. Fluid Sci.
,
48
, pp.
134
146
.
3.
Mohseni
,
K.
, and
Mittal
,
R.
, eds.,
2014
,
Synthetic Jets: Fundamentals and Applications
,
CRC Press
, Boca Raton, FL.
4.
Liu
,
Y. H.
,
Tsai
,
S. Y.
, and
Wang
,
C. C.
,
2015
, “
Effect of Driven Frequency on Flow and Heat Transfer of an Impinging Synthetic Air Jet
,”
Appl. Therm. Eng.
,
75
, pp.
289
297
.
5.
Mahalingam
,
R.
,
Rumigny
,
N.
, and
Glezer
,
A.
,
2004
, “
Thermal Management With Synthetic Jet Ejectors
,”
IEEE Tran. Compon. Packing Tech
,
27
(
3
), pp.
439
444
.
6.
Yassour
,
Y.
,
Stricker
,
J.
, and
Wolfshtein
,
M.
,
1986
, “
Heat Transfer From a Small Pulsating Jet
,”
Eighth International Conference
, San Francisco, CA, Aug. 17–22.
7.
Pavlova
,
A.
, and
Amitay
,
M.
,
2006
, “
Electronic Cooling Using Synthetic Jet Impingement
,”
ASME J. Heat Transfer
,
128
(
9
), pp.
897
907
.
8.
Gillespie
,
M. B.
,
Black
,
W. Z.
,
Rinehart
,
C.
, and
Glezer
,
A.
,
2006
, “
Local Convective Heat Transfer From a Constant Heat Flux Flat Plate Cooled by Synthetic Air Jets
,”
ASME J. Heat Transfer
,
128
(
10
), pp.
990
1000
.
9.
Zhang
,
J. Z.
, and
Tan
,
X. M.
,
2007
, “
Experimental Study on Flow and Heat Transfer Characteristics of Synthetic Jet Driven by Piezoelectric Actuator
,”
Sci. China Tech. Sci.
,
50
(
2
), pp.
221
229
.
10.
Arik
,
M.
,
2008
, “
Local Heat Transfer Coefficients of a High-Frequency Synthetic Jet During Impingement Cooling Over Flat Surfaces
,”
Heat Transfer Eng.
,
29
(
9
), pp.
763
773
.
11.
Chaudhari
,
M.
,
Puranik
,
B.
, and
Agrawal
,
A.
,
2010
, “
Effect of Orifice Shape in Synthetic Jet Based Impingement Cooling
,”
Exp. Therm. Fluid Sci.
,
34
(
2
), pp.
246
256
.
12.
Mangate
,
L. D.
, and
Chaudhari
,
M. B.
,
2015
, “
Heat Transfer and Acoustic Study of Impinging Synthetic Jet Using Diamond and Oval Shape Orifice
,”
Int. J. Therm. Sci.
,
89
, pp.
100
109
.
13.
Liu
,
Y. H.
,
Chang
,
T. H.
, and
Wang
,
C. C.
,
2016
, “
Heat Transfer Enhancement of an Impinging Synthetic Air Jet Using Diffusion-Shaped Orifice
,”
Appl. Therm. Eng.
,
94
, pp.
178
185
.
14.
Valiorgue
,
P.
,
Persoons
,
T.
,
McGuinn
,
A.
, and
Murray
,
D. B.
,
2009
, “
Heat Transfer Mechanisms in an Impinging Synthetic Jet for a Small Jet-to-Surface Spacing
,”
Exp. Therm. Fluid Sci.
,
33
(
4
), pp.
597
603
.
15.
McGuinn
,
A.
,
Farrelly
,
R.
,
Persoons
,
T.
, and
Murray
,
D. B.
,
2013
, “
Flow Regime Characterisation of an Impinging Axisymmetric Synthetic Jet
,”
Exp. Therm. Fluid Sci.
,
47
, pp.
241
251
.
16.
Zhang
,
J. Z.
,
Gao
,
S.
, and
Tan
,
X. M.
,
2013
, “
Convective Heat Transfer on a Flat Plate Subjected to Normally Synthetic Jet and Horizontally Forced Flow
,”
Int. J. Heat Mass Transfer
,
57
(
1
), pp.
321
330
.
17.
Tan
,
X. M.
,
Zhang
,
J. Z.
,
Shan
,
Y.
, and
Xie
,
G. N.
,
2015
, “
An Experimental Investigation on Comparison of Synthetic and Continuous Jet Impingement Heat Transfer
,”
Int. J. Heat Mass Transfer
,
90
, pp.
227
238
.
18.
Taguchi
,
G.
,
1990
,
Introduction to Quality Engineering
,
Asian Productivity Organization
,
Tokyo, Japan
.
19.
Gallas
,
Q.
,
2005
, “
On the Modeling and Design of Zero-net Mass Flux Actuators
,”
Doctoral dissertation
, University of Florida, Gainesville, FL.http://etd.fcla.edu/UF/UFE0008338/gallas_q.pdf
20.
Smith
,
B. L.
, and
Glezer
,
A.
,
1998
, “
The Formation and Evolution of Synthetic Jets
,”
Phys. Fluids
,
10
(
9
), pp.
2281
2297
.
21.
Gallas
,
Q.
,
Wang
,
G.
,
Papila
,
M.
,
Sheplak
,
M.
, and
Cattafesta
,
L.
,
2003
, “
Optimization of Synthetic Jet Actuators
,”
AIAA
Paper No. 2003-635.https://arc.aiaa.org/doi/abs/10.2514/6.2003-635
22.
Castro
,
K.
,
Segura
,
L.
,
Castellanos
,
S.
, and
Lino
,
J.
,
2017
, “
Optimization of Geometric Quality in a 5 Axis Machining of Curved Surfaces in a EN-AW-7075 Alloy by Taguchi Method
,”
Materials Design and Applications
,
L.
Da Silva
, ed.,
Springer
,
Berlin
, p.
347
.
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