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Jet Pumps

A Jet Pump, utilize the kinetic energy of one liquid to cause the flow of another. Jet Pumps operate on the basic principles of flow dynamics.

How Jet Pumps Work

Todd Yates - Sunday, November 17, 2013
Jet Pump, utilize the kinetic energy of one liquid to cause the flow of another. Jet Pumps operate on the basic principles of flow dynamics. This involves taking a high pressure motive stream and accelerating it through a tapered nozzle to increase the velocity of the fluid (gas or liquid) that is put through the nozzle. This fluid is then carried on through a secondary chamber where the friction between the molecules of it and a secondary fluid (generally referred to as the suction fluid) causes this fluid to be pumped. These fluids are intimately mixed together and discharged from the Jet Pump.

Jet Pump Specifications

Jet Pump MOTIVE Connection: This connection is where the power for the eductor is generated, by increasing the velocity of the motive fluid. The Jacoby-Tarbox Jet Pump nozzle in this section takes advantage of the physical properties of the motive fluid. Eductors with liquid motives use a converging nozzle as liquids are not generally compressible. Eductors with gas motives utilize converging-diverging nozzles to achieve maximum benefit from the compressibility of the gas. All Jacoby-Tarbox Jet Pumpnozzles have smooth flow paths. Flow paths with sudden steps or roughness on these high velocity surfaces cause jet pumps to operate less efficiently.

SUCTION Connection: This connection of the Jet Pump is where the pumping action of the Jet Pumptakes place. The motive fluid passes through the suction chamber, entraining the suction fluid as it passes. The friction between the fluids causes the chamber to be evacuated. This allows pressure in the suction vessel to push additional fluid into the suction connection of the jet pump. The high velocity of the motive stream in this section of the Jet Pump directs the combined fluids toward the outlet section of the Jet Pump.

Discharge Connection: As the motive fluid entrains the suction fluid, part of the kinetic energy of the motive fluid is imparted to the suction fluid. This allows the resulting mixture to discharge at an intermediate pressure. The percentage of the motive pressure that can be recovered is dependent upon the ratio of motive flow to suction flow and the amount of suction pressure pulled on the suction port. The mixture then passes through the diverging taper that converts the kinetic energy back to pressure. The combined fluid then leaves the outlet.

For more details about jet pumps go to the jet pump store


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