Transcript John Cushman & Monica Moroni - Purdue University :: Department

Project: Anomalous Dispersion
John H. Cushman1, Natalie Kleinfelter1, Monica
Moroni2
1Department
of Earth and Atmospheric Sciences and
Department of Mathematics, Purdue University, West
Lafayette, IN 47907 (e-mail: [email protected])
2Department of Hydraulics, Transportations and Roads,
University of Rome “La Sapienza” – via Eudossiana 18,
00184 Rome (Italy) (e-mail: [email protected])
“Ingredients” for image analysis
The fluid under investigation and the test section have to be
transparent: mono-phase and multi-phase systems
The fluid has to be seeded with tracer particles with the
following features: same density as water and highly
reflecting
One or more cameras, a high power light source, an
acquisition and digitalization system and image analysis
system are required
Applications
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Fully developed turbulent channel
Porous media
Convective boundary layer
Subduction
Multi-dune channel
Bacteria motion
Ventricular flow
The experimental set-up
Turbulent channel flow (d= 2 cm, x/d = 80, z/d = 10)
Tracers (rp/rf = 1.06, dP = 40 mm)
Fully developed turbulent channel
Fully developed turbulent channel
Applications
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Fully developed turbulent channel
Porous media
Convective boundary layer
Subduction
Multi-dune channel
Bacteria motion
Ventricular flow
Porous media
Porous media
Applications
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Fully developed turbulent channel
Porous media
Convective boundary layer
Subduction
Multi-dune channel
Bacteria motion
Ventricular flow
Experimental set-up
Mixing layer: PTV (low seeding density)
Mixing layer: FT (large seeding density)
Internal waves: FT
Applications
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Fully developed turbulent channel
Porous media
Convective boundary layer
Subduction
Multi-dune channel
Bacteria motion
Ventricular flow
The experimental apparatus
Camera
(top view)
Camera
(lateral view)
x
y
Plate width
- 30 cm
- 20 cm
- 10 cm
z
FT: Trajectories
Fluid #2, plate width= 20 cm, lateral view
FT: Trajectories
Fluid #2, plate width= 20 cm, top view
Applications
•
•
•
•
•
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•
Fully developed turbulent channel
Porous media
Convective boundary layer
Subduction
Multi-dune channel
Bacteria motion
Ventricular flow
The experimental apparatus
300
12
4
15
C1
60
30
30
20
C3
C4
C5
C6
C7
C8
8
8
30
R1
R2
R3
R4
R5
R6
R7
R8
Longitudinal section (dimensions in mm)
Flow out
Flow in
A multi-dune is a device constructed from a sequence of closed
parallel cylindrical tubes welded together in plane. The complex
is sliced down its lateral mid-plane and the lower half is shifted
laterally and then fixed relative to the upper half.
Multi-dune channel
FT – Trajectories: lower flow rate
FT - Trajectories: larger flow rate
Applications
•
•
•
•
•
•
•
Fully developed turbulent channel
Porous media
Convective boundary layer
Subduction
Multi-dune channel
Bacteria motion
Ventricular flow
Bacteria motion
Bacteria motion
Applications
•
•
•
•
•
•
•
Fully developed turbulent channel
Porous media
Convective boundary layer
Subduction
Multi-dune channel
Bacteria motion
Ventricular flow
Investigation of Ventricular Flow
Tank
Head losses
Compliance
Camera
Ventricle
Mirror
Laser
Piston
Motor
Investigation of Ventricular Flow