Monodisperse micro bubbles are a great benefit for the direct fluorination of organic compounds, which is done via a direct injection of gaseous fluorine into the liquid reaction partner. In this two-phase system the fluorination process is improved by the large interfacial area of a chain of micro bubbles compared to slug or jet flow. A predictable generation of micro bubbles with high frequencies will lead to a higher yield and improved selectivity. Moreover, perfluorination is achievable. Here we describe the design and characterisation of a novel potassium hydroxide (KOH) etched nozzle concept for the generation of monodisperse microbubbles in a silicon microreactor. The gas is injected through the KOH-nozzle apex into a perpendicular liquid flow shearing off the gas bubbles. This concept enables a controlled variation of the bubble formation frequency and the gas-liquid interface. The control factors are the aspect ratio and the orientation of the nozzle with respect to the cross flowing liquid.
- Fluids Engineering Division
KOH-Etched Nozzles for Monodisperse Bubble Generation in Microreactors
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Lang, P, Bammesberger, S, & Woias, P. "KOH-Etched Nozzles for Monodisperse Bubble Generation in Microreactors." Proceedings of the ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B. Montreal, Quebec, Canada. August 1–5, 2010. pp. 1419-1426. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30208
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