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. 2015 Feb 24;5:8546. doi: 10.1038/srep08546

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(a, b) Top view of droplets around drift bifurcation. Red crosses indicate the position of the antinode. (c, d) Lateral view of a droplet around drift bifurcation. The horizontal axis is parallel to the short axis of the droplet. Red arrow indicates the peak position of the antinode. White dashed line indicates the center of the droplet. (a) Droplet before drift bifurcation. Positions of the antinodes align (red crosses). The droplet spins very slowly and is almost stationary. f = 111 Hz. (b) Droplet after drift bifurcation. The antinodes near the centroid of the droplet move forward (red crosses). The droplet migrates upward. f = 91 Hz. (c) Droplet before drift bifurcation. f = 107 Hz. (d) Droplet after drift bifurcation. The antinode moves forward (red arrow). The droplet migrates leftward. f = 91 Hz. (a–d) ν = 400 mm²/s, V_d = 0.6 ml, N_a = 5, Γ = 85 m/s².