Abstract:In this article, we experimentally investigate the non-linear behavior of a viscoplastic film flow down an inclined plane. We focus on the non-linear instabilities that appear as roll waves. Roll waves are generated by perturbing a permanent flow of Herschel-Bulkley fluid (Carbopol 980) at low frequencies. To determine the local thickness of the film, we used a laser sensor and a camera to globally capture the transverse shape of the waves. For a regular forcing, the results show the existence of different reg… Show more
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