reactive extraction: fluid dynamics of single droplets

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aqueous dilute NaOH/phenolphthalein single drop hanging and falling in pentanol/acetic acid note: flow pattern typical for low viscous drop falling/rising in high viscous media

zoom in: aqueous dilute NaOH/phenolphthalein single drop hanging and falling in pentanol/acetic acid note: flow pattern typical for low viscous drop falling/rising in high viscous media

top down view: aqueous dilute NaOH/phenolphthalein single drop note the toroidal flow pattern

free flowing single droplet stabilized in a venturi nozzle
mass transfer of phenolphthalein from xylene single drop into aqueous dilute NaOH note: droplet mass transfer on the inflow side is by an order of magnitude faster than on the outflow side of the nozzle
there is a wake of reactant behind the droplet reducing the transfer concentration gradient
whereas the thickness of the interface layer on the inflow side is so thin that it cannot be recognized

free flowing single droplet stabilized in a venturi nozzle
mass transfer of copper from dilute solution into kerosene/LIX64N single drop note: unusual large droplet is oszillating
flow pattern visualized by metal flakes


fluid dynamics of single droplets

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flow pattern during formation of single droplet
xylene single drop in stagnant water phase flow pattern visualized by metal flakes

free flowing single droplet stabilized in a venturi nozzle
xylene single drop in inflow water phase flow pattern visualized by metal flakes