A non-invasive optical technique to map acoustic cavitation activity

Kornpatsitt Promasa, Anthony Gachagan, Stephen Pierce

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

This paper proposes a development of a non-invasive measurement system to monitor acoustic cavitation within a reactor vessel. The measurement technique will detect acoustic emission using an optical approach based on Laser Doppler Velocimetry (LDV). In this study, a LDV scanned the acoustic field in a Perspex walled vessel and characteristic signatures such as the fundamental frequency, harmonics, sub-harmonics and the high frequency acoustic emission associated with cavitation have been identified in the frequency domain and used to provide a measure of the strength of the cavitation activity. It has been proposed that the components are generated by acoustic emission from cavitation bubble. In particular, the amount of acoustic cavitation activity is calculated by a broadband integrated noise power within the frequency range between 1 MHz to 8 MHz. The excitation transducer was a 40 kHz Tonpilz device to generate cavitating field and cavitation was measured across a range of excitation power levels corresponding to 10 – 40 W. The measured results clearly illustrate ‘hot-spots’ and ‘cold-spots’ associated with the regions of cavitation and were verified using a conventional aluminium foil erosion test.
Original languageEnglish
Title of host publicationProceedings of the 8th International Symposium on Cavitation
EditorsClaus-Dieter Ohl, Evert Klaseboer, Siew Wan Ohl, Shi Wei Gong, B.C. Khoo
Pages88-92
Number of pages5
DOIs
Publication statusPublished - 2012
EventThe 8th International Symposium on Cavitation - , Singapore
Duration: 13 Aug 201216 Aug 2012

Conference

ConferenceThe 8th International Symposium on Cavitation
CountrySingapore
Period13/08/1216/08/12

Keywords

  • non-invasive
  • optical technique
  • map
  • acoustic cavitation activity

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  • Cite this

    Promasa, K., Gachagan, A., & Pierce, S. (2012). A non-invasive optical technique to map acoustic cavitation activity. In C-D. Ohl, E. Klaseboer, S. W. Ohl, S. W. Gong, & B. C. Khoo (Eds.), Proceedings of the 8th International Symposium on Cavitation (pp. 88-92) https://doi.org/10.3850/978-981-07-2826-7_122