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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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