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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

Explore research outputs by the European Policies Research Centre...

A non-invasive optical technique to map acoustic cavitation activity

Promasa, Kornpatsitt and Gachagan, Anthony and Pierce, Stephen (2012) A non-invasive optical technique to map acoustic cavitation activity. In: Proceedings of the 8th International Symposium on Cavitation. CAV 2012 Organizers & Research Publishing Services, pp. 88-92. ISBN 9789810728267

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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.