NA-05 - Cleaning: Cleaning Nozzles

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Definition and range of application
Fundamentals
Characteristics
Nozzle types
Nozzle inserts
Pulling force – Water jet force, Number of nozzl...
Pressure losses
Number of cleaning cycles
Damage due to high pressure cleaning
Resistance to the stresses of high pressure cleani...
Use of cleaning nozzles
Practical recommendations
Summary

Pressure losses

Pressure loss in the cleaning nozzle (3)

What does the optimal beam deflection mean in connection with cleaning nozzles?

Image:

Beam deflection [FI-KEG]

FI-KEG

Company information KEG mbH, Burgstädt/Herrenhaide, Germany.

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When a liquid is poured into a chalice shaped glass, the liquid is deflected over the rounded bottom and out of the glass with a low energy loss.

If, however the liquid is poured vertically into a cup with a flat bottom, the liquid is deflected symmetrically towards the cup sides. This produces intense mixing and a strong reduction of kinetic energy.

Liquid jets, including the pressure water jets, are by definition free jets [Kraat1989] [Rinal2003] [Freim1998].

Kraat1989

Kraatz, W.: Flüssigkeitsstrahlen, In: Bollrich, G. (Hrsg): Technische Hydromechanik, Band 2, VEB Verlag für Bauwesen, Berlin (1989).

Rinal2003

Rinaldi, P.: Über das Verhalten turbulenter Freistrahlen in begrenzten Räumen, Dissertation, TU München, Lehrstuhl für Hydraulik und Gewässerkunde (2003).

Freim1998

Freimann, R.: Flüssigkeitsstrahlen: Strömungsmechanische Kenngrößen praxisrelevanter Strahlformen, In: Wasser / Abwasser, Das Gas- und Wasserfach (Hrsg.), (140) Jahrgang, H. 6, Oldenbourg Industrieverlag GmbH, München (1998).