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Investigation on flow patterns, local stresses, and resulting droplet deformation in orifices during high-pressure homogenization

Preiss, Felix Johannes; Kelemen, Katharina; Bisten, Ariane; 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 homogenisation (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 to shear and elongational stress, turbulence and cavitation, 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 an HPH process, which should result in a specific droplet size, is still mostly based on 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 Poster
Publikationsdatum 05.03.2019
Sprache Englisch
Identifikator KITopen-ID: 1000133386
Veranstaltung Annual Meeting of the ProcessNet "Agglomeration und Schüttguttechnik" and "Lebensmittelverfahrenstechnik" (2019), Lausanne, Schweiz, 05.03.2019 – 07.03.2019
Projektinformation DFG, DFG EIN, SCHU 1417/11-1
Schlagwörter orifice; µ-PIV; high-pressure homogenization
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