Characterization of acoustic cavitation in water and molten aluminum alloy

Sergey Komarov, Kazuhiro Oda, Yasuo Ishiwata, Nikolay Dezhkunov

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

High-intensive ultrasonic vibrations have been recognized as an attractive tool for refining the grain structure of metals in casting technology. However, the practical application of ultrasonics in this area remains rather limited. One of the reasons is a lack of data needed to optimize the ultrasonic treatment conditions, particularly those concerning characteristics of cavitation zone in molten aluminum. The main aim of the present study was to investigate the intensity and spectral characteristics of cavitation noise generated during radiation of ultrasonic waves into water and molten aluminum alloys, and to establish a measure for evaluating the cavitation intensity. The measurements were performed by using a high temperature cavitometer capable of measuring the level of cavitation noise within five frequency bands from 0.01 to 10 MHz. The effect of cavitation treatment was verified by applying high-intense ultrasonic vibrations to a DC caster to refine the primary silicon grains of a model Al-17Si alloy. It was found that the level of high frequency noise components is the most adequate parameter for evaluating the cavitation intensity. Based on this finding, it was concluded that implosions of cavitation bubbles play a decisive role in refinement of the alloy structure.

Original languageEnglish
Pages (from-to)754-761
Number of pages8
JournalUltrasonics Sonochemistry
Volume20
Issue number2
DOIs
Publication statusPublished - 2013 Mar
Externally publishedYes

Keywords

  • Aluminum melts
  • Cavitation onset
  • Noise measurement
  • Structure refinement
  • Ultrasonic cavitation
  • Vibration amplitude

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Environmental Chemistry
  • Radiology Nuclear Medicine and imaging
  • Acoustics and Ultrasonics
  • Organic Chemistry
  • Inorganic Chemistry

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