Cartography of liquid-liquid flow in corrugated millichannels
Résumé
If the interest of continuous heat exchanger/reactors have been demonstrated for homogeneous liquid phase applications, many chemical syntheses take place in multiphase media (gas-liquid, liquid-liquid, gas-liquid-solid...). Thus, in order to evaluate the versatility criterion of a plate-type heat exchanger/reactor with a 2D-meandering millichannel, this work is focused on the characterization of hydrodynamics of liquid-liquid two-phase flow in the reaction channel. For this purpose, several prototypes have been built with different millichannels of increasing dimensions to address as well the scale-up issue. Flow visualizations are performed by using a high-speed camera; four flow regimes with octanol/water fluid system are observed: annular/plug, annular, annular/dispersed, and dispersed flows. The study shows that the interfacial tension and the dispersed phase inertia are the main forces that drive the interface. A dimensionless map based on the Weber number of the dispersed phase as a function of the internal Dean number of the continuous phase is built up. This map turns out to be valid regardless of the size of the corrugated millichannel.
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