Surface effects on spinodal decomposition of incompressible binary fluid mixtures
Institute of Industrial Science, University of Tokyo - Meguro-ku,
Tokyo 153-8505, Japan
Accepted: 16 May 2000
We demonstrate the first three-dimensional simulations of bicontinuous spinodal decomposition of incompressible binary fluid mixtures in a confined geometry. We find that after an initial transient the thickness of a wetting layer L grows with time t as by a diffusion process and later as by a hydrodynamic one. We confirm that the hydrodynamic pumping of fluid via bicontinuous tubes plays dominant roles in the late-stage thickening dynamics of a wetting layer. A domain connected to the wetting layer grows faster than in bulk, which is suggestive of the hydrodynamic origin of the fast-mode kinetics found by Wiltzius and Cumming.
PACS: 64.75.+g – Solubility, segregation, and mixing; phase separation / 68.45.Gd – Wetting / 47.20.Dr – Surface-tension-driven instability
© EDP Sciences, 2000