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Development of a pressure stable inline droplet generator with live droplet size measurement

Preiss, Felix; Dagenbach, Teresa; Fischer, Markus; Karbstein, Heike Petra

For the research on droplet deformation and breakup in scaled high-pressure homogenizing units, a pressure stable inline droplet generator was developed. It consists of an optically accessible flow channel with a combination of stainless steel and glass capillaries and a 3D printed orifice. The droplet size is determined online by live image analysis. The influence of the orifice diameter, the mass flow of the continuous phase and the mass flow of the disperse phase on the droplet diameter were investigated. Furthermore, the droplet detachment mechanisms were identified. Droplet diameters with a small diameter fluctuation between 175 µm and 500 µm could be realized, which allows a precise adjustment of the capillary (Ca) and Weber (We) Number in the subsequent scaled high pressure homogenizer disruption unit. The determined influence of geometry and process parameters on the resulting droplet size and droplet detachment mechanism agreed well with the literature on microfluidics. Furthermore, droplet trajectories in an exemplary scaled high-pressure homogenizer disruption unit are presented which show that the droplets can be reinjected on a trajectory close to the center axis or close to the wall, which should result in different stresses on the droplets.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129130
Veröffentlicht am 29.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2305-7084
KITopen-ID: 1000129130
Erschienen in ChemEngineering
Verlag MDPI
Band 4
Heft 60
Seiten 1-14
Schlagwörter droplet breakup; microfluidic droplet generation; live image analysis; orifice; high pressure homogenization
Nachgewiesen in Dimensions
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