Abstract
The wavy dynamics of a viscous film flowing axisymmetrically on a vertical fiber is characterized experimentally. The study of the initial response of the flow to natural noise shows a well-defined transition between a convective and an absolute instability [1]. In the convective case, disturbances of controlled frequencies have been applied at inlet. The flow responds to inlet excitation at frequencies lower than a well-defined cut-off frequency. A good agreement has been found with the linear stability analysis and with the solution to a two-equation model [2] in the nonlinear regime.
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Duprat, C., Ruyer-Quil, C. & Giorgiutti-Dauphiné, F. Experimental study of the instability of a film flowing down a vertical fiber. Eur. Phys. J. Spec. Top. 166, 63–66 (2009). https://doi.org/10.1140/epjst/e2009-00879-9
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DOI: https://doi.org/10.1140/epjst/e2009-00879-9