1. Project Background
The Army Medical Research Lab needs to validate their CFD models for healthy and diseased lungs
RIT will perform particle image velocimetry (PIV) on lung models to validate the CFD.
The senior design team will design and develop the lung models and testing apparatus.
Jake

2. What is PIV? Used for flow visualization and velocity measurements
Fluid is seeded with tiny tracer particles
The particles are illuminated using a laser sheet, and a camera takes pictures of the particles.
Fluid velocity profiles can be obtained by analyzing particle movement from frame to frame.
Jake

4. Pressure Control Subsystem
Comprised of:
T-hose splitter
Dual flow needle valve
Amplified voltage pressure transducer
Powered breadboard
Ryan

5. Pressure Control Path Fluid will leave outlet
With steady state conditions fluid will separate due to splitter and apply static pressure on sensor
Flow will be adjusted with needle valve based on logger pro readout compared to desired conditions
Ryan
Back to pump

6. Flow Characteristics
Viscosity determined through index matching, (550 SSU, 109 cP, Pa-s)
Much higher than water (1 cP)
Flow tested by Army is from 2-10 L/min
Using Reynolds number matching, 6-32 GPM
Pressure through system ranges from 10 psi to 63 psi
Calculated using Poiseuille flow
Morgan

7. Index Matching and Viscosity Determination
Needed to match an index of refraction of 1.45
At 20⁰C, Viscosity in centipoise

8. Reynolds Number Matching

9. Pipe Schematic

11. Pressure through System

12. Pressure Loss Components
Pressure loss due to head loss
Pressure loss due to gravity
Pressure loss due to change in velocity

13. 1 Q
From 1->2, the flow rate reduces from Q to Q/8, since it exits the lung model at the fourth generation
From 2->3, the flow rate is increased from Q/8 -> Q/4. There are 80 outlets and each manifold accepts 20 outlets.
From 3->4, the flow rate increases from Q/4->Q. The 2nd common header combines the remaining outlets into a single tube. 2
Q/8 3
Q/4 4 Q