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Calibration and performance assessment of an innovative high-temperature cavitometer.

Tzanakis, I*; Hodnett, M; Lebon, G S B*; Dezhkunov, N*; Eskin, D G* (2016) Calibration and performance assessment of an innovative high-temperature cavitometer. Sens. Actuators A, Phys., 240. pp. 57-69.

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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 and it operates through a long tungsten waveguide with bandwidth sufficient to enable acoustic emissions associated with cavitation activity to be monitored. The derived calibration sensitivity can be used to estimate acoustic pressures (in Pa), providing physical and consequently practical meaning to cavitation measurements within liquid metals. After the calibration process, a comparison with a cavitation sensor developed at the National Physical Laboratory was performed. Results 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 real-time acoustic pressures distributed within a cylindrical clay crucible filled with liquid aluminium (Al) has been performed for first time. The use of the calibrated cavitometer will establish a more generalized approach for measurements of the actual acoustic pressures over a broad range of liquid temperatures within a sonicated medium, so demonstrating its potential use as a tool in optimizing, controlling and scaling up processes.

Item Type: Article
Keywords: Cavitation, bubbles, liquid aluminium, sensor, acoustic emissions, frequency spectrum
Subjects: Acoustics
Acoustics > Ultrasound
Identification number/DOI: 10.1016/j.sna.2016.01.024
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6997

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