Fig. 5.

Striped patterns in a capillary. (A) The ternary mixture in a $4$ cm-long capillary slowly phase separates to form alternating layers of oil and water at the boundary with the aqueous phase. (Scale bar, $100\mu$m.) (B) The immiscibility front $d$ is followed as a function of time for three ternary mixtures. The slopes of the linear fits give $D^{\star }$ for each composition, as shown in Inset, consistent with the prediction Eq. 4. (C) Spacing ${\lambda }_i$ of the water and oil layers in a phase-separated capillary shows good agreement between experiments and theory. (D) Simulation of the modified CH equation (Eq. 5) showing the formation of alternating layers of oil and water in the confinement of a capillary.