Generation of high power ultrasound by spark discharges in water

J.W. Mackersie, I. Timoshkin, S.J. MacGregor

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

It is impractical to achieve the desired combination of power and bandwidth from conventional electromechanical acoustic sources. However, these characteristics can be achieved by the use of pulsed power technology to generate high-power ultrasound (HPU). High-voltage pulses induce the electrical breakdown of water and the resulting bubble formation and collapse produce acoustic waves of high power and frequency. The dynamics of spark generated bubbles are formulated to predict the development of the bubble radius with time and an experimental system to produce a consistent source of spherically symmetric HPU acoustic waves is described. Pressure pulses due to both bubble formation and collapse were detected and, although their relative amplitudes varied, their frequency spectra did not differ significantly. The amplitude of the acoustic output rises sharply for applied pulse energies up to /spl sim/25 J but the effect saturates indicating little gain and poor efficiency by using high-energy pulses. Variation of the source topology in the form of the electrode separation was found to be the most important factor in the acoustic output. The detected HPU increased as the source became larger but as the two-thirds power of the electrode separation, thereby showing progressively diminishing enhancement. The frequency content of the acoustic signal did not appear to vary with either applied pulse energy or the electrode separation.
LanguageEnglish
Pages1715-1724
Number of pages9
JournalIEEE Transactions on Plasma Science
Volume33
Issue number5
DOIs
Publication statusPublished - 2005

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electric sparks
acoustics
bubbles
water
pulses
electrodes
pressure pulses
output
sparks
electrical faults
energy
high voltages
topology
bandwidth
radii
augmentation

Keywords

  • acoustic generators
  • bubbles
  • sparks
  • ultrasonic waves
  • plasma science
  • ultrasound

Cite this

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title = "Generation of high power ultrasound by spark discharges in water",
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Generation of high power ultrasound by spark discharges in water. / Mackersie, J.W.; Timoshkin, I.; MacGregor, S.J.

In: IEEE Transactions on Plasma Science, Vol. 33, No. 5, 2005, p. 1715-1724.

Research output: Contribution to journalArticle

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