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 loss through system ranges from 20 psi to 50 psi– Calculated using Poiseuille flow

Positive Displacement vs. Centrifugal

Conclusion: PD pumps provided better flow control, regardless of pressure and handle high viscosities.

Graph Credit: pumpschool.com

PD Pump SelectionPump Flow Rates Pressures Comments Cost (3 highest)

Gear pump Acceptable,Up to 30 gpm

Acceptable,Up to 50 psi

Common, can be self-priming

2

Rotary Vane Acceptable Acceptable Not really used in our application, better for thin fluids and high pressure differentials

2

Diaphragm Acceptable Acceptable Create pulsing flow, need air supply, cheaper

1

Lobe Pump Acceptable Acceptable Used in Sanitary applications where fragile solids are used, bi-rotational, may be overly complex

3

Image Credit: Wikipedia; Info Credit: pumpscout.com

3 GPM 35 GPM

6 GPM 33 GPM19 GPM

Siewert, 1.6-16 GPM, $2,079

Siewert, 3.2-32 GPM, $2,319

Siewert, 2.3-23 GPM, $2,189

Emerick, 3.3-33 GPM, $2,754

• Max flow rate: 33 GPM• Min flow rate: 3.3 GPM• Max Pressure: 200 psi• Speed Ratio: N/A• Price: $2,745• Shipping not included• Lead time: 3-4 weeks

• Max flow rate: 32 GPM• Min flow rate: 3.2 GPM• Max Pressure: 100 psi• Speed Ratio: 10:1• Price: $2,319• Shipping included• Installation Assistance• Lead time: 5-6 weeks

Emerick Siewert

Inhalation Pipe Schematic