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Characterizing the cavitation development and acoustic spectrum in various liquids

Characterizing the cavitation development and acoustic spectrum in various liquids

Tzanakis, I., Lebon, G. S. B., Eskin, D. G. and Pericleous, K. A. ORCID: 0000-0002-7426-9999 (2016) Characterizing the cavitation development and acoustic spectrum in various liquids. Ultrasonics Sonochemistry, 34. pp. 651-662. ISSN 1350-4177 (doi:https://doi.org/10.1016/j.ultsonch.2016.06.034)

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Abstract

A bespoke cavitometer that measures acoustic spectrum and is capable of operating in a range of temperatures (up to 750 degC) was used to study the cavitation behaviour in three transparent liquids and in molten aluminium. To relate these acoustic measurements to cavitation development, the dynamics of the cavitation bubble structures was observed in three Newtonian, optically transparent liquids with significantly different physical properties: water, ethanol, and glycerine. Each liquid was treated at 20 kHz with a piezoelectric ultrasonic transducer coupled to a titanium sonotrode with a tip diameter of 40 mm. Two different transducer power levels were deployed: 50% and 100%, with the maximum power corresponding to a peak-to-peak amplitude of 17 lm. The cavitation structures and the flow patterns were filmed with a digital camera. To investigate the effect of distance from the ultrasound source on the cavitation intensity, acoustic emissions were measured with the cavitometer at two points: below the sonotrode and near the edge of the experimental vessel. The behaviour of the three tested liquids was very different, implying that their physical parameters played a decisive role in the establishment of the cavitation regime. Non dimensional analysis revealed that water shares the closest cavitation behaviour with liquid aluminium and can therefore be used as its physical analogue in cavitation studies; this similarity was also confirmed when comparing the measured acoustic spectra of water and liquid aluminium.

Item Type: Article
Uncontrolled Keywords: Acoustic spectrum; Cavitation bubbles; Cavitation development; water; glycerine; ethanol; aluminium
Subjects: Q Science > QA Mathematics
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
Related URLs:
Last Modified: 02 Mar 2019 15:53
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/16740

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