Effect of pseudo-gravitational acceleration on the dissolution rate of miscible drops

Abstract

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.

Spinning Drop Dynamics in Miscible and Immiscible Environments

“…By measuring the drop radius and using Vonnegut’s formula (see below), he inferred the effective (transient) interfacial tension between the fluids. Similar measurements were performed by J. Pojman and co-workers, − who investigated the existence of an effective interfacial tension (EIT) between miscible fluids and discussed its importance, using (i) mixtures of Isobutyric acid and water close to their critical point and (ii) dodecyl acrylate drops in poly­(dodecyl acrylate). They concluded that capillary forces are at work at the boundary between these fluids and quantified the EIT, again using Vonnegut’s theory.…”