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Structure et dynamique non-linéaire de liquides tombants

Abstract : A liquid overflowing from an overhang can exhibit complex dynamical behaviours, caused by both effects of free-surface and gravity. In our framework, we use wetting and viscous liquids under a constant feed. For weak flow-rates, we have drops, whereas at higher flow-rates, a pattern of liquid columns is observed. In the case of an overflowing circular dish, the pattern is one-dimensional and describes a circle. In this " fountain ", the columns may have collective motions: drifting domains, oscillations, spatio-temporal chaos. Chaos is associated to defects in the spatio-temporal structure (non-constant number of columns), which cause the system to be impredictible. At high flow-rates, liquid sheets are observed. Under an overflowing cylinder, a vertical liquid curtain is a convenient workbench for studying wakes, holes, and an original propagating instability looking like a chessbroad.
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https://pastel.archives-ouvertes.fr/tel-00002242
Contributor : Philippe Brunet <>
Submitted on : Tuesday, January 7, 2003 - 7:22:48 PM
Last modification on : Saturday, September 26, 2020 - 11:44:03 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:04:12 PM

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  • HAL Id : tel-00002242, version 1

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Philippe Brunet. Structure et dynamique non-linéaire de liquides tombants. Dynamique des Fluides [physics.flu-dyn]. Université Pierre et Marie Curie - Paris VI, 2002. Français. ⟨tel-00002242⟩

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