A new particle image velocimetry system is applied to measure turbulent air jet flows from a micro-scale nozzle. The applied MPIV system includes a long-distance microscope that enables not only a long working distance, but also a forward-scattering optical setup. By using a high repeating rate Nd:YAG laser and an advanced digital camera, particle image recordings can be captured at 60 fps, i.e. 30 PIV recording pairs per second, with an interframing time of 180 ns, so that a high-speed flow measurement is enabled in micro scale. Measurements were conducted in the central plane of an air jet from a nozzle of 500 μm in diameter at flow velocity up to 110 m/s. Mean velocity and Reynolds stress distributions were determined with statistical analyses of thousands of instantaneous velocity maps.

Volume Subject Area:
Fluids Engineering
Topics:
Electromagnetic scattering, Jets, Microscale devices, Particulate matter, Radiation scattering, Scattering (Physics), Turbulence, Air jets, Flow (Dynamics), Nozzles, Flow measurement, Microscopes, Nd-YAG lasers, Statistical analysis, Stress
1.
Gui
L
;
Merzkirch
W
 (
1996
)
A method of tracking ensembles of particle images
.
Exp. Fluids
21
:
465
–
468
2.
Gui
L
;
Merzkirch
W
;
Shu
JZ
 (
1997
)
Evaluation of low image density PIV recordings with the MQD method and application to the flow in a liquid bridge
.
Journal of Flow Visualization and Image Processing
, Vol.
4
, No.
4
,
333
–
343
3.
Gui
L
;
Wereley
ST
 (
2002
)
A correlation-based continuous window shift technique for reducing the peak locking effect in digital PIV image evaluation
.
Exp. Fluids
32
:
506
–
517
4.
Lee SY; Wereley ST; Gui L; Qu W; Mudawar I (2002) Microchannel flow measurement using micro particle image velocimetry. Intl. Mechanical Engineering Congress and Exposition, New Orleans, Louisiana, November 17–22
5.
Lee SY; Jang J; Wereley ST (2004) Entrance length of Low Reynolds number flow in microchannel. Proc. ASME/IMECE, Paper #2004-61908, (Anaheim, CA, Nov.).
6.
Meinhart
CD
;
Zhang
H
 (
2000
)
The flow structure inside a microfabricated inkjet printer head
.
J. Microelectromechanical Systems
9
:
67
–
75
7.
Meinhart
CD
;
Wereley
ST
;
Santiago
JG
 (
1999
)
PIV measurements of a microchannel flow
.
Exp. Fluids
27
:
414
–
419
8.
Meinhart
CD
;
Wereley
ST
;
Santiago
JG
 (
2000
)
A PIV algorithm for estimating time-averaged velocity fields
.
Journal of Fluids Engineering
122
:
285
–
289
9.
Meinhart CD; Santiago JG; Adrian RJ; Wereley ST (2003) Micron Resolution Particle Image Velocimeter. US Patent 6,653, 651, Nov. 25
10.
Santiago
JG
;
Wereley
ST
;
Meinhart
CD
;
Beebe
DJ
;
Adrian
RJ
 (
1998
)
A particle image velocimetry system for microfluidics
.
Exp. Fluids
25
:
316
–
319
11.
Tkaczyk E; Handa V; Lee S; McNally H; Gui L; Wereley S; Bashir R (2002) Determination of the charge attached to micro-scale devices used in fluidic self-assembly processes. 2002 MIRS Fall Meeting, Symposium F - Nanocrystalline Semiconductor Materials and Devices, December 2–5, Boston, Massachusetts
12.
Wereley ST; Santiago JG; Meinhart CD; Adrian RJ (1998) Velocimetry for MEMS Applications. Proc. of ASME/DSC, Vol. 66, (Micro-fluidics Symposium, Nov., Anaheim, CA)
13.
Wereley
ST
;
Gui
L
;
Meinhart
CD
 (
2002
a)
Advanced algorithms for microscale velocimetry
,
AIAA Journal
, Vol.
40
,
#6
#6
14.
Wereley ST; Lee SY; Gui L (2002b) Entrance length and turbulence transition in microchannels. Amer. Phys. Soc./Div. Fluid Dyn. Annual Meeting, Dallas, TX, November
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