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Dissolution dynamics of liquid/liquid binary mixtures within a micromodel

Dissolution dynamics of liquid/liquid binary mixtures within a micromodel
Dissolution dynamics of liquid/liquid binary mixtures within a micromodel
We report optical observations of the dissolution behaviour of glycerol/water, soybean oil/hexane, and isobutyric acid (IBA)/water binary mixtures within a glass micromodel built as a 2D regular network of capillary tubes with diameter of 0.2 mm. The micromodel is initially filled with solute and then is horizontally immersed into a thermostatic solvent-filled bath. The micromodel is open at its corners for solute dissolution to occur with no pressure gradients being applied. Our study shows that the solvent penetration into the micromodel is diffusion-dominated in completely miscible binary mixtures (glycerol/water and soybean oil/hexane). This is, however, non-Fickian diffusion with the dissolution rate, dV/dt, being proportional to D 1/3t -0.4 for almost the entire duration of the experiment (V is the volume occupied by the solvent, D is the diffusion coefficient, and t is time). For the partially miscible IBA/water mixture the experiments performed at undercritical temperatures revealed that the diffusive transport was negligible despite the mixture being out of its thermodynamic equilibrium. The water phase penetrated into some of the channels, but IBA was never completely displaced/dissolved from the micromodel and numerous interfaces remained visible after very long-time periods.
binary mixture, liquid/liquid phase transition, dissolution rate, non-fickian diffusion, micromodel
0169-3913
407-424
Stevar, M.S.P.
7bfd6d60-deb0-44d0-ae32-b6d75533c29a
Vorobev, A.
911a4e1e-0c34-4297-b52e-c22a2b9dec01
Stevar, M.S.P.
7bfd6d60-deb0-44d0-ae32-b6d75533c29a
Vorobev, A.
911a4e1e-0c34-4297-b52e-c22a2b9dec01

Stevar, M.S.P. and Vorobev, A. (2013) Dissolution dynamics of liquid/liquid binary mixtures within a micromodel. Transport in Porous Media, 100 (3), 407-424. (doi:10.1007/s11242-013-0223-1).

Record type: Article

Abstract

We report optical observations of the dissolution behaviour of glycerol/water, soybean oil/hexane, and isobutyric acid (IBA)/water binary mixtures within a glass micromodel built as a 2D regular network of capillary tubes with diameter of 0.2 mm. The micromodel is initially filled with solute and then is horizontally immersed into a thermostatic solvent-filled bath. The micromodel is open at its corners for solute dissolution to occur with no pressure gradients being applied. Our study shows that the solvent penetration into the micromodel is diffusion-dominated in completely miscible binary mixtures (glycerol/water and soybean oil/hexane). This is, however, non-Fickian diffusion with the dissolution rate, dV/dt, being proportional to D 1/3t -0.4 for almost the entire duration of the experiment (V is the volume occupied by the solvent, D is the diffusion coefficient, and t is time). For the partially miscible IBA/water mixture the experiments performed at undercritical temperatures revealed that the diffusive transport was negligible despite the mixture being out of its thermodynamic equilibrium. The water phase penetrated into some of the channels, but IBA was never completely displaced/dissolved from the micromodel and numerous interfaces remained visible after very long-time periods.

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e-pub ahead of print date: 29 October 2013
Published date: December 2013
Keywords: binary mixture, liquid/liquid phase transition, dissolution rate, non-fickian diffusion, micromodel
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 359470
URI: http://eprints.soton.ac.uk/id/eprint/359470
ISSN: 0169-3913
PURE UUID: ba34b923-0953-463b-a005-c0c1486d8c93
ORCID for A. Vorobev: ORCID iD orcid.org/0000-0002-6458-9390

Catalogue record

Date deposited: 04 Nov 2013 14:05
Last modified: 20 Jul 2019 00:51

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