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Evolution d'une suspension de fibres dans un champ ultrasonore stationnaire

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Several suspensions of cellulose fibres in water which were exposed to an intensive and relatively uniform ultrasonic field were investigated. Two concurring effects of the radiation pressure are observed:

An orientation of the fibres parallel to the wave planes during a characteristic period of time which is a function of their length;

a rearrangement of the fibres in the nodal planes of the sound pressure during a period which is a function of their diameters.

Usually, both periods are of the same order of magnitude, i.e. about 10 seconds. The measurements were carried out with incoherent light scattered into the different directions. The results show that this technique can be applied to the quick determination of the distribution of the dimensions of various types of fibres of industrial interest, in particular in paper pulp.


Nous avons étudié diverses suspensions aqueuses de fibres de cellulose soumises à un champ ultrasonore stationnaire intense et relativement uniforme. On observe deux effets de la pression de radiation qui se produisent concurremment: 1° une réorientation des fibres parallèlement aux plans d'onde, avec un temps caractéristique fonction de leurs longueurs; 2° un regroupement ou stratification des fibres dans les plans nodaux de pression acoustique, avec un temp caractéristique fonction de leurs diamètres. Typiquement, le premier est de l'ordre de la seconde et le deuxième de l'ordre d'une dizaine de secondes. La mesure se fait par l'intermédiaire de l'intensité de la lumière incohérente diffusée dans diverses directions. Ces résultats indiquent la possibilité d'utiliser cette technique pour la détermination rapide de la distribution des dimensions de divers types de fibres d'intérêt industriel, particulièrement celles de pâte à papier.


Es wurden verschiedene Suspensionen von Zellulosefasern in Wasser untersucht, die einem intensiven und relativ gleichmäßigen Ultraschallfeld ausgesetzt wurden. Man beobachtet zwei konkurrierende Effekte des Strahlungsdrucks:

Eine Orientierung der Fasern parallel zu den Wellenebenen in einer Zeit, die charakteristisch von der Fasernlänge abhängt;

Eine Umlagerung der Fasern in den Knotenebenen des Schalldrucks in einer Zeit, die von ihrem Durchmesser abhängt.

In der Regel sind beide Zeiten von gleicher Größenordnung, nämlich etwa 10 Sekunden. Die Messungen wurden mit inkohärentem Licht durchgeführt, das in die verschiedenen Richtungen gestreut wird. Diese Ergebnisse zeigen, daß diese Technik auf die schnelle Bestimmung der Größenverteilung verschiedener, industriell bedeutsamer Faserarten angewandt werden kann, insbesondere in Papiermassen.
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Document Type: Research Article

Publication date: 01 May 1988

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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