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. 2012 Dec 31;110(3):859–864. doi: 10.1073/pnas.1211706110

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Fig. 2. — Dynamics of a set of equally spaced monodisperse plugs. The initial length of the plugs is , and the distance separating two adjacent plugs is mm. The whole train is pushed at constant pressure head 2.0 kPa. (A) Image corresponding to the experiment. (Upper) Initial plug configuration; liquid (air) appears light (dark) gray. (Lower) Spatiotemporal diagram displaying the gray values along the center line of the channel as a function of time. Velocities and lengths of the plugs are obtained from the slopes of the boundaries and the distances between them, respectively. The gray dashed line indicates the moment when the plugs reach the initial position of their immediate predecessor. (Right) Capillary number of the plug train as a function of time. (B) Spatiotemporal diagram obtained numerically from the model for the same conditions as in A.

Inline graphic — Dynamics of a set of equally spaced monodisperse plugs. The initial length of the plugs is , and the distance separating two adjacent plugs is mm. The whole train is pushed at constant pressure head 2.0 kPa. (A) Image corresponding to the experiment. (Upper) Initial plug configuration; liquid (air) appears light (dark) gray. (Lower) Spatiotemporal diagram displaying the gray values along the center line of the channel as a function of time. Velocities and lengths of the plugs are obtained from the slopes of the boundaries and the distances between them, respectively. The gray dashed line indicates the moment when the plugs reach the initial position of their immediate predecessor. (Right) Capillary number of the plug train as a function of time. (B) Spatiotemporal diagram obtained numerically from the model for the same conditions as in A.