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   Accueil > Annuaire > C. Ruyer-Quil > resume-Hayoun-Aussois-15

Thin liquid film in polymer tubing : dynamics and dewetting in partial wetting condition

P. Hayoun, A. Letailleur, J. Teisseire, E. Verneuil, F. Lequeux and E. Barthel (SIMM)

Polymers such as PVC and Silicone are low cost material widely used in the industry to produce tubing for fluid transport. Most of these applications involve repeated, intermittent flow of liquids which can lead to unwanted contamination. This study aims at better understanding contamination mechanisms during intermittent flow in polymer tubing, and at elucidating the relation between flow parameters, chemical affinity and contamination rates. We investigate, experimentally and theoretically, flow regimes as well as dewetting process at the triple line, induced by gravity flow of a vertical liquid slug in a cylindrical geometry. Our results for Newtonian fluids evidence a succession of thick film formation, hydraulic jump creation in the thickness profile, oscillatory regime and destabilization leading to substrate contamination. In order to understand theoretically the flow, one crucial quantity to assess is the film thickness in the inside of the tube. Based on an absorption measurement method, we provide explanations for behaviours and flow regimes observed experimentally.

Dernière modification : March 26 2015, 15:33:17.