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Fiber suspensions flowing in structured media are encountered in manybiological and industrial systems. Interactions between fibers and thetransporting flow as well as fiber contact with obstacles can lead to complexdynamics. In this work, we combine microfluidic experiments and numericalsimulations to study the interactions of a rigid fiber with an individualequilateral triangular pillar in a microfluidic channel. Four dominant fiberdynamics are identified: transport above or below the obstacle, pole vaultingand trapping, in excellent agreement between experiments and modeling. Thedynamics are classified as a function of the length, angle and lateral positionof the fibers at the channel entry. We show that the orientation and lateralposition close to the obstacle are responsible for the fiber dynamics and welink those to the initial conditions of the fibers at the channel entrance.Direct contact between the fibers and the pillar is required to obtain strongmodification of the fiber trajectories, which is associated to irreversibledynamics. Longer fibers are found to be more laterally shifted by the pillarthan shorter fibers that rather tend to remain on their initial streamline. Ourfindings could in the future be used to design and optimize microfluidicsorting devices to sort rigid fibers by length.

Non-trivial dynamics of rigid fibers interacting with triangular obstacles in microchannel flows