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Metamorphoses of a Pulsating Water Jet

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Erkannte Entitäten
Sprachtranskript
A pulsating water jet is leaving a nozzle with an outlet 5 mm in diameter. It is disintegrating into drops. Stroboscopic illumination synchronized to the velocity changes at the nozzle reveals details of the breakdown of the jet. The camera slowly follows the water jet into a region far removed from the nozzle.
This is the undisturbed jet. Here the experimental set-up is shown. A modulation can be applied in a plenum chamber just upstream from the nozzle.
For closer inspection we have partially dismantled the apparatus.
The water flows through a semipermeable piston of sinter material, which is connected to a shaker. The shaker is controlled by a sinegenerator.
The disturbed water jet.
By using stroboscopic illumination (as applied in the initial scene of this film) we get a fundamentally different impression. We appear to observe a stationary phenomenon, which is
comparable to a freeze frame. In reality we have a dynamical process. Here is the proof. We get the impression of a slow motion exposure as soon as the modulation frequency is slightly divergent from the flash frequency. The disintegrated jet in close-ups changing the modulation amplitude. At low frequencies an overtaking effect can be demonstrated. At very high modulation amplitudes bizarre formations in the shape of strings of pearls are formed. They exhibit high form stability. Gravity splits the pulsating jet into several parallel strands.
A close-up view. At a higher frequency and very high amplitude we observe bouncing and a laterally displaced liquid lamella. Changing the amplitude and the frequency causes new shapes to occur. They repeat themselves in synchrony with the pulse frequency.
In a vertical jet we get identical shapes symmetrically to the axis of the jet. Here a water crown is shown. Slowly turning the nozzle makes the different peaks turn in the same wise. Partial disturbance of the jet, here to the left of the axis, only slightly influences the stability of the right-hand structure. Obviously the shape of
the jet is mainly determined by local and temporal disturbances as the jet leaves the nozzle.
A theoretical model of the jet's metamorphosis is available.
Computeranimation
Steckdose
Modulation
Regentropfen
Wasserstrahlantrieb
Beleuchtungsstärke
Fahrgeschwindigkeit
Düse
Stroboskop
Funkenentladung
Computeranimation
Nassdampfturbine
Kolben
Besprechung/Interview
Feuerwehrfahrzeug
Schmitt-Trigger
LUNA <Teilchenbeschleuniger>
Wasserstrahlantrieb
Computeranimation
Störlichtbogen
Kaltumformen
Modulation
Beschusszeichen
Parallelschaltung
Stringtheorie
Wasserstrahlantrieb
Tonfrequenz
Seitenleitwerk
Formationsflug
Prozessleittechnik
Trenntechnik
Bildfrequenz
Beleuchtungsstärke
Zerfallsreihe
Langwelle
Amplitude
Klangeffekt
Nassdampfturbine
Haspel <Textiltechnik>
Wasserstrahlantrieb
Seitenleitwerk
Tonfrequenz
Erdefunkstelle
Düse
Kristallgitter
Amplitude
Computeranimation
Wasserstrahlantrieb
Düse
Computeranimation
Plancksches Strahlungsgesetz
Computeranimation

Metadaten

Formale Metadaten

Titel Metamorphoses of a Pulsating Water Jet
Alternativer Titel Metamorphosen eines pulsierenden Wasserstrahls
Autor Meier, G. E. A.
Grabitz, Georg
Lizenz Keine Open-Access-Lizenz:
Es gilt deutsches Urheberrecht. Der Film darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
DOI 10.3203/IWF/C-1800
IWF-Signatur C 1800
Herausgeber IWF (Göttingen)
Erscheinungsjahr 1992
Sprache Englisch
Produzent IWF (Göttingen)
Produktionsjahr 1990

Technische Metadaten

IWF-Filmdaten Film, 16 mm, LT, 89 m ; F, 8 1/2 min

Inhaltliche Metadaten

Fachgebiet Physik
Abstract Auswahl einer Reihe besonders charakteristischer Veränderungen in einem Wasserstrahl von 3,2 mm und 5 mm Durchmesser, der abwechselnd beschleunigt und verzögert aus einer Düse austritt. Formänderungen entlang des Strahls. Zeittransformation (20-200 Hz) mit synchroner stroboskopischer Beleuchtung. Lamellen in Form von Kronen und Blasen, Laufzeiteffekt; Ausbildung horizontaler Reihen von Tropfen auf Parabelbahnen.
Selection of a series of particularly characteristic changes in a water jet of 3.2 and 5 mm diameter projected at various speeds from a nozzle. Time-loop transformation (20-200 Hz) with synchronized stroboscope light: lamellae in the form of crowns and bubbles together with running-time effects and the formation of horizontal rows of drops in parabolic arcs.
Schlagwörter Horizontale Perlenketten
Laufzeiteffekt
Kronen
Lamellen
Tropfen
Blasenbildung
Pulsieren
Wasserstrahl
water jet
pulsating
bubble formation
drops
lamellae
crowns
running-time effect
horizontal pearl chain

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