Particle Image Velocimetry of a Hypoxia Chamber
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Transcript of Particle Image Velocimetry of a Hypoxia Chamber
Adaptation of the PIV System to the Analysis of Flow Fields in a Hypoxia
Chamber
Alvin ZhangMichael SanfeliceYevgeniy Yesilevskiy
ME160 Engineering Experimentation: Section A Group 2
Background
Taken from LaVision
Application to Wind Tunnel
Laser
Laser Sheet
Air Flow
Seed Particles
Camera
From Diouf, Penn State University
Two separate images
User-defined grid is placed
Images are overlaid
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Images are overlaid
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Vector field is calculated
Adapting the Hypoxia Chamber for PIV
Slanted Sides
Improve Clarity
Introduce Seed Particles
From Caubel , Foley, Todorov: Optimization of a Laboratory Animal Enclosure for the Study of
Sleep Apnea
Cage Redesign
Seeding the Cage
Compressed Air Inlet
Oil Container
Adjustment Knob
Seed Outlet
Laser Absorber
Seed Exit
Chimney
Side Facing Camera
Side Facing Laser
Seed Particle
Inlet
Image Taking Setup
Power Supply Inputs and
Cooling Input
Mirror
Beam Spreader
Output to Computer
Tripod
Camera Focus
Considerations
•Cross Flow▫Causes inaccurate vector field.
•The seed particles have many different velocities▫The vector field is very sensitive to the dt
choice
Seed particles
Time Step too Long
Actual Motion
Perceived Motion
Good Time Step Selection
Choosing Correct Time Step
JUM February 1, 2011 vol. 30 no. 2
187-195
Choosing Correct Time Step
Without Diffuser
Position [mm]
Posi
tion
[m
m]
Without Diffuser
Without Diffuser
Without Diffuser
Without Diffuser
Without Diffuser
Without Diffuser
With Diffuser
With Diffuser
With Diffuser
With Diffuser
With Diffuser
With Diffuser
With Diffuser
With Diffuser
With Diffuser
With Diffuser
Conclusions and Recommendations
•Characterize random uncertainty•Calibrate measurement axes.•Improve procedure for choosing dt•Measure steady state velocities•Multiple chimneys•Fans
Acknowledgements
•Thank you to Professors Delagrammatikas, Sidebotham, and Consiglio for help in compiling this study.
•Thank you also to LaVision representative Steve Anderson
Powerpoint outline• General PIV background (i.e. for wind tunnel)• Flow: Very well suited for wind tunnel, this is how it applies to
hypoxia• Specific Application to Hypoxia project (Box Design and the
video you made)• Flow: How was that put into practice?• Schematic of set up downstairs (Autocad or actual pictures)• Flow: Now that system is made, how to get results?• Process to take measurements (screen shots)• Flow: Analyze those measurements• Results• Flow: How meaningful are they? • Error• Conclusion and Recommendations