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Cavitation patterns in high-pressure homogenization nozzles with cylindrical orifices: Influence of mixing stream in Simultaneous Homogenization and Mixing

Gall, V.; Rütten, E.; Karbstein, H. P.

Abstract:

High-pressure homogenization is the state of the art to produce high-quality emulsions with droplet sizes in the submicron range. In simultaneous homogenization and mixing (SHM), an additional mixing stream is inserted into a modified homogenization nozzle in order to create synergies between the unit operation homogenization and mixing. In this work, the influence of the mixing stream on cavitation patterns after a cylindrical orifice is investigated. Shadow-graphic images of the cavitation patterns were taken using a high-speed camera and an optically accessible mixing chamber. Results show that adding the mixing stream can contribute to coalescence of cavitation bubbles. Choked cavitation was observed at higher cavitation numbers σ with increasing mixing stream. The influence of the mixing stream became more significant at a higher orifice to outlet ratio, where a hydraulic flip was also observed at higher σ. The decrease of cavitation intensity with increasing back-pressure was found to be identical with conventional high-pressure homogenization. In the future, the results can be taken into account in the SHM process design to improve the efficiency of droplet break-up by preventing cavitation or at least hydraulic flip.


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Originalveröffentlichung
DOI: 10.1007/s42757-020-0088-9
Scopus
Zitationen: 5
Dimensions
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2661-8869, 2661-8877
KITopen-ID: 1000132145
Erschienen in Experimental and Computational Multiphase Flow
Verlag Springer
Band 4
Seiten 156–164
Vorab online veröffentlicht am 19.01.2021
Schlagwörter high-pressure homogenization cavitation, simultaneous homogenization and mixing (SHM), shadow-graphic images, orifice, choked flow, hydraulic flip
Nachgewiesen in Dimensions
Scopus
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