Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-01-13
Phys. Rev. E 81, 016302 (2010)
Physics
Condensed Matter
Soft Condensed Matter
20 pages, 22 figures, accepted for publication in Physical Review E
Scientific paper
10.1103/PhysRevE.81.016302
Emulsion Stability Simulations (ESS) are used to estimate the coalescence time of one drop of hexadecane pressed by buoyancy against a planar water/hexadecane interface. In the present simulations the homophase is represented by a big drop of oil at least 500 times larger than the approaching drop ($1\,\mu$m to $10\,\mu$m). Both deformable and non-deformable drops are considered along with six different diffusion tensors. In each case van der Waals, electrostatic, steric and buoyancy forces are taken into account. The coalescence times are estimated as the average of 1000 random walks. It is found that the repulsive potential barrier has a significant influence in the results. The experimental data can only be reproduced assuming negligible repulsive barriers, as well as non-deformable drops that move with a combination of Stokes and Taylor tensors as they approach the interface.
García-Sucre Máximo
Rojas Clara
Urbina-Villalba Germán
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