Vórtices no estacionarios en un vaso de agua
AUTOR(ES)
Manjón, F.J., Villalba, J.M., Arribas, E., Nájera, A., Beléndez, A., Monsoriu, J.A.
FONTE
Rev. Bras. Ensino Fís.
DATA DE PUBLICAÇÃO
2013-09
RESUMO
Who has not experienced the formation of a vortex or a whirlpool in a glass of milk when trying to dissolve cocoa in it by stirring the liquid with a spoon? In this paper, we analyse the mechanical aspects of the unsteady vortex formed in swirling water that was stirred with a spoon around a central axis in a cylindrical glass. We show that the formed unsteady vortex is of forced type and we compare the fluid dynamics of this unsteady vortex to that of the well-known steady free and forced vortices and with the dynamics of the unsteady free isolated vortex (also known as Oseen-Lamb's vortex). We show that the observation of the generation and decay of the unsteady vortex in a cylindrical glass of rotating water is a simple experiment that may constitute a very fruitful experience for understanding the kinematics, dynamics, and static aspects of the axisymmetric, rotational, or torsional flow of an homogeneous and incompressible fluid.
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