Characterization of cavitation under ultrasonic horn tip

proposition of an acoustic cavitation parameter

Gregor Kozmus (Author), Jure Zevnik (Author), Marko Hočevar (Author), Matevž Dular (Author), Martin Petkovšek (Author)

Abstract

Acoustic cavitation, generated by a piezo-driven transducer, is a commonly used technique in a variety of processes, from homogenization, emulsification, and intensification of chemical reactions to surface cleaning and wastewater treatment. An ultrasonic horn, the most commonly used acoustic cavitation device, creates unique cavitation conditions under the horn tip that depend on various parameters such as the tip diameter, the driving frequency of the horn, its amplitude, and fluid properties. Unlike for hydrodynamic cavitation, the scaling laws for acoustic cavitation are poorly understood. Empirical relationships between cavitation dynamics, ultrasonic horn operating conditions, and fluid properties were found through systematic characterization of cavitation under the tip. Experiments were conducted in distilled water with various sodium chloride salt concentrations under different horn amplitudes, tip geometries, and ambient pressures. Cavitation characteristics were monitored by high-speed (200,000 fps) imaging, and numerous relations were found between operating conditions and cavitation dynamics. The compared results are discussed along with a proposal of a novel acoustic cavitation parameter and its relationship to the size of the cavitation cloud under the horn tip. Similar to the classical hydrodynamic cavitation number, the authors propose for the first time an acoustic cavitation parameter based on experimental results.

Keywords

acoustic cavitation;cavitation number;ultrasonic horn;salt solutions;

Data

Language:	English
Year of publishing:	2022
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	532.528
COBISS:	121319171
ISSN:	1350-4177
Views:	355
Downloads:	100
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	akustična kavitacija;kavitacijsko število;ultrazvočna konica;solne raztopine;
Type (COBISS):	Article
Pages:	str. 1-10
Issue:	ǂVol. ǂ89
Chronology:	2022
DOI:	10.1016/j.ultsonch.2022.106159
ID:	16469410