The Positive Displacement pump option allows users to model the behavior (either steady or periodic flow) of a reciprocating positive displacement pump.

Parameter

• Volumetric Flow Rate - Fix the volumetric flow rate through the pump.

• Mass Flow Rate - Fix the mass flow rate through the pump.

Flowrate

There are three ways to define the flowrate:

• Steady - The flowrate will be fixed at the specified value throughout the transient. This is a good approximation for many Positive Displacement Pumps.

• Periodic (simple) - Some Positive Displacement Pumps have a distinct pulsing behavior depending on the number of Heads and speed of the pump. This can be defined here, with a preview of the imposed flow being shown on the right of the tab.

• Periodic (detailed) - If detailed information is known about the positive displacement pump, a more accurate periodic behavior can be defined by providing the bore diameter, pump stroke length, and connecting rod length of pump slider crank.

Submerged Pump

Represents a pump with a fixed head or pressure at suction. See Submerged Pump.