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1. Introduction
The jet pumps are in usebecause of its Simplicity of itsconcept for imparting energy to
a fluid stream.
Being successfully used in
remote environments for manyindustrial applications
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Jet Pump
eductor A high pressure, high velocity jet discharge is
used to pump a larger volume of fluid.
Advantages
no moving parts
self priming
handles solids easily
Disadvantage
inefficient
Uses
deep well pumping
pumping water mixed with solids
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1. Introduction
The jet pumps consists of followingparts :
NozzleA Suction box
A Mixing Tube (Throat)
A diffuser on downstream side
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Fig.1 Diagrammatic Arrangement of Jet Pump showing mixing process
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2. Classification of Jet-pumps
There are four basic forms of jet pump:
Gas-Gas.Liquid-Liquid.Gas-Liquid.
Liquid-Gas.
Note: The first mentioned fluid above in each caseis used to drive the pump
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3. Principle of operation
The operation of jet pump can be
separated into the following zones:
Acceleration of the Driving &
Induced flows.
Mixing of the two fluids (Primary &Secondary)
The decrease in velocity in thediffuser (Which converts KineticEnergy to Potential Energy)
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8/20Fig.2 PRESSURE VARIATIONS ALONG A JET PUMP
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Fig. 3 Jet Pump Assembly (Horizontal)
Driving fluid
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Fig. 4 Jet Pump Assembly (Vertical Unit)
With Adjustable Nozzle
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5. Adjustable Nozzle
By providing a needle valve for thenozzle (Fig.6 & Fig.7) the nozzle/throat
ratio can be varied and, in this way, the
operating range of the jet pump (or jet-centrifugal combination) can be
increased. The needle valve adjustment
can be made either manually as shown in
Fig.6 or automatically
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Efficiency
Energy Increase of suction stream
=Energy decrease of Driving Stream
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Fig. 9 Efficiency of Jet Pumps
Fig. 10 Efficiency of Jet Pumps for different Reynolds Number
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Fig. 13 Settling Chamber removes Sand from Water by using a Jet-Pu
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Fig.14 Use of Jet Pump in Deep-well Pumping
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Fig. 16 Jet Pump in Priming Device
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4.40e+02
3.91e+02
3.42e+02
2.93e+02
2.44e+02
1.96e+02
1.47e+02
9.78e+01
4.89e+01
3.98e-02
Fig Velocity Vectors in Air-water jet mixing - CFD simulation
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