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Calibration and performance assessment of an innovative high-temperature cavitometer

Calibration and performance assessment of an innovative high-temperature cavitometer

Tzanakis, I., Hodnett, M., Lebon, G. S. B., Dezhkunov, N. and Eskin, D. G. (2016) Calibration and performance assessment of an innovative high-temperature cavitometer. Sensors and Actuators A: Physical, 240. pp. 57-69. ISSN 0924-4247 (doi:10.1016/j.sna.2016.01.024)

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Abstract

This paper describes a series of systematic experimental studies to evaluate the performance of a high-temperature cavitometer under well-controlled conditions. The cavitometer was specifically designed for measurements in liquid metals: it operates through a long tungsten waveguide (probe), providing thermal protection to the piezo sensing elements placed outside the hot area, and with sufficient bandwidth to enable the monitoring of broadband acoustic emissions associated with cavitation activity. It was calibrated electrically, and acoustically, at kHz and MHz frequencies, and so can be used to estimate acoustic pressures (in Pa), providing physical, and consequently practical, meaning to cavitation measurements within liquid metals. Results obtained from ultrasonic sources in a cylindrical vessel using water showed that the cavitometer is a reliable and robust device for characterizing direct field acoustic pressures and broadband emissions from the resulting cavitation. Additionally, preliminary characterization of the real-time acoustic pressures during ultrasonic processing of liquid aluminium (Al) in a standard clay-graphite crucible were performed for the first time. The use of the calibrated cavitometer will establish a more generalized approach for measuring the actual acoustic pressures over a broad range of liquid temperatures within a sonicated medium, demonstrating its potential use as a tool for optimizing, controlling, and scaling-up processes.

Item Type: Article
Additional Information: This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords: Cavitation; Cavitometer; Liquid metal; Sensor; Acoustic emissions; Frequency spectrum; Sonochemistry
Faculty / Department / Research Group: Faculty of Architecture, Computing & Humanities
Faculty of Architecture, Computing & Humanities > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG)
Faculty of Architecture, Computing & Humanities > Department of Mathematical Sciences
Last Modified: 18 Apr 2017 15:17
Selected for GREAT 2016: GREAT a
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/14836

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