Effect of pseudo-gravitational acceleration on the dissolution rate of miscible drops
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Pubblicato un nuovo articolo sulla rivista Chaos in collaborazione con il Prof. Pojman e il suo gruppo di ricerca alla Lousiana State University.
Si trata di un lavoro che prosegue nella ricerca sui sistemi lontani dall'equilibrio, in particolare sui fenomeni di interfaccia fra liquidi miscibili. Per questo motivo il lavoro è stato pubblicato sul numero speciale per celebrare i cento anni dalla nascita di Ilya Prigogine, il padre della termodinamica dei sistemi lontani dall'equilibrio.
FOCUS ISSUE: DISSIPATIVE STRUCTURES AND IRREVERSIBILITY IN NATURE: CELEBRATING THE 100TH ANNIVERSARY OF ILYA PRIGOGINE’S BIRTH
Volume 27, Issue 10, October 2017
Effect of pseudo-gravitational acceleration on the dissolution rate of miscible drops
The effect of pseudo-gravitational acceleration on the dissolution process of two phase miscible systems has been investigated at high acceleration values using a spinning drop tensiometer with three systems: 1-butanol/water, isobutyric acid/water, and triethylamine/water. We concluded that the dissolution process involves at least three different transport phenomena: diffusion, barodiffusion, and gravitational (buoyancy-driven) convection. The last two phenomena are significantly affected by the centrifugal acceleration acting at the interface between the two fluids, and the coupling with the geometry of the dissolving drop leads to a change of the mass flux during the course of the dissolution process.
When two miscible fluids are brought into contact, the mixing process is not instantaneous and during its course an interface between them is evident. The dissolution process is the result of different transport phenomena, and some of them are dependent on the acceleration field acting at the interface. In a system rotating at high speed the centrifugal acceleration can have a significant effect promoting or preventing some of the transport phenomena. This fact, coupled with the geometrical parameters of the system may lead to a peculiar dissolution process.
