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Article

Development of a Pressure Stable Inline Droplet Generator with Live Droplet Size Measurement

Institute of Process Engineering in Life Sciences, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Formerly Schuchmann.
ChemEngineering 2020, 4(4), 60; https://doi.org/10.3390/chemengineering4040060
Received: 31 July 2020 / Revised: 21 August 2020 / Accepted: 2 November 2020 / Published: 10 November 2020
(This article belongs to the Special Issue Emulsion Process Design)
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. View Full-Text
Keywords: droplet breakup; microfluidic droplet generation; live image analysis; orifice; high pressure homogenization droplet breakup; microfluidic droplet generation; live image analysis; orifice; high pressure homogenization
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MDPI and ACS Style

Preiss, F.J.; Dagenbach, T.; Fischer, M.; Karbstein, H.P. Development of a Pressure Stable Inline Droplet Generator with Live Droplet Size Measurement. ChemEngineering 2020, 4, 60. https://doi.org/10.3390/chemengineering4040060

AMA Style

Preiss FJ, Dagenbach T, Fischer M, Karbstein HP. Development of a Pressure Stable Inline Droplet Generator with Live Droplet Size Measurement. ChemEngineering. 2020; 4(4):60. https://doi.org/10.3390/chemengineering4040060

Chicago/Turabian Style

Preiss, Felix J., Teresa Dagenbach, Markus Fischer, and Heike P. Karbstein 2020. "Development of a Pressure Stable Inline Droplet Generator with Live Droplet Size Measurement" ChemEngineering 4, no. 4: 60. https://doi.org/10.3390/chemengineering4040060

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