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Unlike Newtonian fluids, viscoelastic fluids may break time-reversal symmetryat low Reynolds numbers resulting in elastic turbulence. Furthermore, undersome conditions, instead of the chaotic turbulence, large-scale regular wavesform, as has been shown for DNA flowing in microfluidic pillar arrays. We heredemonstrate how the symmetry of the individual pillars influences the symmetryof these waves, thereby contributing to the understanding of the origin of thewaves and opening up for better control of the waves with relevance toapplications such as microfluidic sorting and mixing. The onset of waves occursat different Deborah numbers for flow in different directions through the samearray. Because the onset of waves leads to an increase in flow rate for a givendriving pressure, we observe an increase in diodicity within this range.

Broken Symmetries in Microfluidic Pillar Arrays are Reflected in a Flowing DNA Solution across Multiple Length Scales