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Pulsed Ultrasonic Cavitation. Part I: Cavitation noise, luminescence thresholds, nuclei distribution

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Cavitation is obtained in a 160 cm3 distilled water sample by pulses of ultrasonic waves (frequency f = 700 kHz), with pulse parameters in the following ranges: 20 V < V < 200 V; 30 μs < τ < 1 s; 10−3 Hz < ν < 3·104 Hz; 1 ≦ N = (τ ν)−1 < 104. Hydrophone and photomultiplier output voltages are recorded.

Threshold transducer voltage for sound noise, V s(τ, N), and for luminescence, V L(τ, N), are operationally defined, by means of slow cycles of pulse height modulation. The experimentally found sound noise threshold surface N = N s(V, τ) and luminescence threshold surface N = N L(V, τ) divide the pulse parameter space in three regions: o, (V, τ, N s < N < ∞), no cavitation region; s, (V, τ, N L < N < N s), sound noise cavitation region of “stable” cavitation, within the two threshold surfaces; 1, (V, τ, 1 ≦ N < N L), luminescence cavitation region of “stable” and “transient” cavitation.

The level curves N = N L(V, τ = const) are nuclei distributions on V. These allow the evaluation of the nuclei distribution on R 0 (gas-vapour nuclei radius) in the range 0,5·10−5 cm to 2·10−5 cm.

Neutron water irradiation produces positive shifting along N of the threshold surfaces, which give the distribution of the nuclei produced in the explored two octave range.
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Document Type: Research Article

Publication date: 01 January 1970

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  • 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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