Particle Image Velocimetry

Particle Image Velocimeter Mechanical Engineering Department ,GIET

Contents Introduction Principle 2 Components 3 Experiment & Results 4 Applications 5 1 Advanced PIV’s 6

Flow Measurement Introduction
Non-Intrusive Methods
Particle Image velocimeter
W ithout interfering with the fluid.
Intrusive Methods
Orifice Meter
Needs to interact directly with the fluid

Principle 1 2 3 4 5 6 Schematic diagram of principle behind PIV.

Components Seeding
10μm silver coated glass particles used.
Enhances Total internal reflection of laser.
Same density as Fluid
Laser
Nd:YAG Lasers or Copper vapour lasers used.
Illuminates the flow field.
FLASH LIGHT type effect.
Generates Thin light sheet-single plane is imaged.
Camera
Converts optical brightness into electrical amplitude signals using CCDs.
Very high frame rate.
Calibrated to yield the displacement in the object plane.
Co- relation
For 2-D pattern recognition.
Interrogation space= n*tiles
Searches First image -> in second image.
Calculates a displacement vector for each tile.
“ INSIGHT 3G “ package used.

Experimental setup

Results
Two Consecutive Frames .
Arrows show Processed
image.
Two vortices-Spotted

Head of displacement arrow at final position and tail of arrow at initial position of SEED. Magnified Results

2 Motion Of Fishes in water. Aerodynamic Analysis Of Helicopters. Application 3 1 PROSTHETIC Heart Valves.

Future PIV’s are coming up with 3-D Motion tracing facilities. Advanced PIVs

OPEN FOR DISCUSSION References: [1] Markus Raffel, Christian E. Willert, and Jurgen Compenhans, Particle Image Velocimeter- A Practical Guide, Springer Publ. Ltd. [2] Operating Manual, PIV Data Processing, Mechanical Systems & Control Lab., JU, Kolkata, India. Dr.P.C.Mishra & Jadavpur University,kolkata Acknowledgements: By: SAMEER DUBEY

BACKUP1-Cross Co-relation Algorithm
The mask and the
pattern being sought
are similar the,
cross correlation will be
high.
The mask is itself
an image which needs
to have the same
functional appearance
as the pattern to be
found.
CROSS CORELATION is a standard method of estimating the degree to which two 2-D Images (series) are correlated. Mask (red rectangle) is centered at every pixel in the 1 st image and the cross correlation is Calculated.

BACKUP2-Charged Coupled devices Charge coupled devices or CCD’s are arrays of semiconductor gates formed on a substrate of an integrated circuit or chip The charge collected and stored in each gate of the array represents a picture element or pixel of an image. IC (integrated circuit) and control circuits typically mounted on a printed wiring assembly for camera control. Add Your Title

BY: Sameer Dubey 4 th Year,Mechanical Engineer Gandhi Institute of Engineering and Technology (GIET) Gunupur,ORISSA And Dr.Purna Chandra Mishra Kalinga Institute of Industrial Technology (KIIT) Bhubaneshwar,ORISSA

Particle Image Velocimetry

by Colloquium on Oct 22, 2009

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