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For a few drops more

Experiments in microfluidics reveal long-range orientational correlations in the velocities of flowing droplets that can be rationalized in terms of an analytically solvable model.

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Figure 1: Disc-shaped water droplets (black) translating along a confined oil layer deform the flow field as shown by the red streamlines (initially the oil flows uniformly to the right).

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Correspondence to Howard A. Stone.

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Stone, H., Thutupalli, S. For a few drops more. Nature Phys 10, 87–88 (2014).

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