Three flow regimes of viscous jet falling onto a moving surface

Details Three flow regimes of viscous jet falling onto a moving surface Three flow regimes of viscous jet falling onto a moving surface

2008-11-16

arxiv.org/abs/0811.2574v1

Physics

Fluid Dynamics

Scientific paper

A stationary viscous jet falling from an oriented nozzle onto a moving surface is studied, both theoretically and experimentally. We distinguish three flow regimes and classify them by the convexity of the jet shape (concave, vertical and convex). The fluid is modeled as a Newtonian fluid, and the model for the flow includes viscous effects, inertia and gravity. By studying the characteristics of the conservation of momentum for a dynamic jet, the boundary conditions for each flow regime are derived, and the flow regimes are characterized in terms of the process and material parameters. The model is solved by a transformation into an algebraic equation. We make a comparison between the model and experiments, and obtain qualitative agreement.

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