Kelvin-Helmholtz instability as one of the key features for fast and efficient emulsification by hydrodynamic cavitation
Journal Article
·
· Ultrasonics Sonochemistry
- University of Ljubljana (Slovenia)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- European Research Council (ERC); Slovenian Research Agency; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 2470072
- Journal Information:
- Ultrasonics Sonochemistry, Journal Name: Ultrasonics Sonochemistry Vol. 108; ISSN 1350-4177
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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