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Comparison of µ-PIV flow pattern measurements and CFD simulation of high-pressure homogenizer orifices

Walzel, Peter; Bisten, Ariane; Schaldach, Gerhard; Preiss, Felix Johannes; Karbstein, Heike Petra

Abstract (englisch):
Emulsions have a wide scope of applications. They can be found in the cosmetic, chemical, pharmaceutical, and food industry. Emulsion properties, such as stability, rheological behavior, and color depend on the droplet size and droplet size distribution (DSD) of the emulsion. High-pressure homogenization (HPH) is mostly used to produce emulsions with droplets smaller than one micrometer. During this process, an emulsion premix with larger droplets is pumped with a pressure of several hundred bar through a disruption unit. In this unit, the characteristic dimension through which the product flows, is significantly reduced. This results in a drastic increase in flow velocity. Thereby, droplets are exposed stresses resulting from laminar, turbulent and cavitating flow patterns, which cause droplet breakup. Nonetheless, the influence of geometrical or process parameters on resulting droplet sizes is still focus of ongoing research. Therefore, the design of a HPH process, which should result in a specific droplet size, is still mostly based on process functions and empirical knowledge.
This investigation focuses on the influence of the geometry of the disruption unit, and the process parameters on the local flow pattern and resulting stresses. ... mehr

Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Vortrag
Publikationsdatum 28.05.2019
Sprache Englisch
Identifikator KITopen-ID: 1000130174
Veranstaltung Jahrestreffen Reaktionstechnik gemeinsam mit der Fachgruppe Mehrphasenströmungen (2019), Würzburg, Deutschland, 27.05.2019 – 29.05.2019
Projektinformation DFG, DFG EIN, SCHU 1417/11-1
Bemerkung zur Veröffentlichung Vortragender: Felix Johannes Preiss
Schlagwörter µ-PIV; CFD
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