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

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

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

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

Flow Characteristics Viscosity determined through index matching, (550 SSU, 109 cP, 0.109 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

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

Reynolds Number Matching

Pipe Schematic

Pressure through System

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

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