Fluid Mechanics

Fluid machine may be divided into two groups :

Positive displacement :

can produce very high pressures
hydraulic fluid pump
high pressure water washers

Peristaltic Pump:

Fluid only contacts tubing
Tubing ID and roller velocity with respect to the tubing determine flow rate
Tubing eventually fails from fatigue and abrasion
Fluid may leak past roller at high pressures
Viscous fluids may be pumped more slowly

Gear Pump

fluid is trapped between gear teeth and the housing

Two-lobe Rotary Pump

Rotary Pump

gear pump with two "teeth" on each Gear
Same Principle as gear pump
fewer Chambers - more extreme pulsation

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