Hydro-dynamical models for the chaotic dripping faucet

Details Hydro-dynamical models for the chaotic dripping faucet Hydro-dynamical models for the chaotic dripping faucet

2004-08-20

arxiv.org/abs/physics/0408096v1

Physics

Fluid Dynamics

16 pages, 14 figures. Under review for Journal of Fluid Mechanics

Scientific paper

10.1017/S0022112004002307

We give a hydrodynamical explanation for the chaotic behaviour of a dripping faucet using the results of the stability analysis of a static pendant drop and a proper orthogonal decomposition (POD) of the complete dynamics. We find that the only relevant modes are the two classical normal forms associated with a Saddle-Node-Andronov bifurcation and a Shilnikov homoclinic bifurcation. This allows us to construct a hierarchy of reduced order models including maps and ordinary differential equations which are able to qualitatively explain prior experiments and numerical simulations of the governing partial differential equations and provide an explanation for the complexity in dripping. We also provide a new mechanical analogue for the dripping faucet and a simple rationale for the transition from dripping to jetting modes in the flow from a faucet.

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