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Rivulets and their meandering on a partially wetting surface present aninteresting problem, as complex behavior arises from a deceptively simplesetup. Recently Couvreur and Daerr suggested that meandering is caused by aninstability developing as the flow rate $Q$ increases to a critical value$Q_c$, with stationary (pinned) meandering being the final state of the flow.We tried to verify this assertion experimentally, but instead produced resultscontradicting the claim of Couvreur and Daerr. The likely reason behind thediscrepancy is the persistence of flow-rate perturbations. Moreover, the theorypresented in this paper cannot reproduce the states as considered and disagreeswith other theories.

Comment on "The role of wetting heterogeneities in the meandering instability of a partial wetting rivulet"