Žan Boček (Author), Martin Petkovšek (Author), Samuel J. Clark (Author), Kamel Fezzaa (Author), Matevž Dular (Author)

Abstract

The paper investigates the oil–water emulsification process inside a micro-venturi channel. More specifically, the possible influence of Kelvin-Helmholtz instability on the emulsification process. High-speed visualizations were conducted inside a square venturi constriction with throat dimensions of 450 µm by 450 µm, both under visible light and X-Rays. We show that cavity shedding caused by the instability results in the formation of several cavity vortices. Their rotation causes the deformation of the oil stream into a distinct wave-like shape, combined with fragmentation into larger drops due to cavitation bubble collapse. Later on, the cavity collapse further disperses the larger drops into a finer emulsion. Thus, it turns out that the Kelvin-Helmholtz instability is similarly characteristic for hydrodynamic cavitation emulsification inside a microchannel as is the Rayleigh-Taylor instability for acoustically driven emulsion formation.

Keywords

emulsion;hydrodynamic cavitation;Kelvin-Helmholtz instability;Venturi microchannels;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 532.528
COBISS: 201951491 Link will open in a new window
ISSN: 1350-4177
Views: 46
Downloads: 2
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Other data

Secondary language: Slovenian
Secondary keywords: emulzija;hidrodinamska kavitacija;Kelvin-Helmholtzova nestabilnost;Venturijevi mikrokanali;
Type (COBISS): Article
Pages: str. 1-9
Issue: ǂVol. ǂ108, [article no.] 106970
Chronology: Aug. 2024
DOI: 10.1016/j.ultsonch.2024.106970
ID: 24549645