Soap opera in the maze: Geometry matters in Marangoni flows

This paper is associated with a video winner of a 2017 APS/DFD Gallery of Fluid Motion Award. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0098

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Figure 1

Snapshots of a 0.2% solution of soap solving a small maze filled with milk, from time $t=0$ s until $t=11$ s, when the red dye reaches the exit. The width of the channels is 4 mm. DOI: https://doi.org/10.1103/APS.DFD.2017.GFM.V0098

Figure 2

Snapshots of a 0.2% solution of soap solving a larger and more complex maze, also filled with milk. The red dye used as tracer reaches the exit at time $t=60$ s. The width of the channels is 3 mm. DOI: https://doi.org/10.1103/APS.DFD.2017.GFM.V0098