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• W4385514706 abstract "In this article, we experimentally investigate the nonlinear behaviour of a viscoplastic film flow down an inclined plane. We focus on the nonlinear 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 regimes. First, we observe primary instabilities below the cut-off frequency at the entrance of the channel. After the exponential growth of the wave in the linear regime, we recognise the nonlinear dynamics with the existence of finite amplitude waves. This finite amplitude depends on the frequency, the Reynolds number and the inclination angle. The results show that this instability is supercritical. At moderate Reynolds numbers, the finite 2-D waves become sensitive to transverse perturbations, due to a secondary instability, and become 3-D waves. The experimental results illustrate a phenomenology of viscoplastic film flows similar to Newtonian fluids, except for the capillary waves." @default.
• W4385514706 created "2023-08-04" @default.
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• W4385514706 date "2023-08-01" @default.
• W4385514706 modified "2023-10-18" @default.
• W4385514706 title "Nonlinear evolution of viscoplastic film flows down an inclined plane" @default.
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• W4385514706 doi "https://doi.org/10.1140/epje/s10189-023-00316-4" @default.
• W4385514706 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37535112" @default.
• W4385514706 hasPublicationYear "2023" @default.
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