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Medición completa de la helicidad y su dinámica en tubos de vórtice

Martin W Scheeler¹, Wim M van Rees², Hridesh Kedia¹

¹Department of Physics, The University of Chicago, Chicago, IL 60637, USA.

Science (New York, N.Y.)

|August 5, 2017

Resumen

Los investigadores midieron la helicidad del fluido en el agua, encontrando que se conserva incluso en flujos viscosos. Esto desafía las suposiciones anteriores y ayuda a comprender la dinámica de los vórtices.

Área de la Ciencia:

Dinámica de fluidos
Mecánica topológica de fluidos

Sus antecedentes:

Helicity cuantifica el entrelazamiento de vórtices en el flujo de fluidos.
Se conserva en fluidos inviscidos pero se disipa por la viscosidad.
Medir la helicidad total en fluidos reales es un desafío.

Objetivo del estudio:

Para medir la helicidad total en tubos de vórtice de núcleo delgado en agua.
Para investigar la conservación de la helicidad y la evolución en los flujos viscosos.

Principales métodos:

Medición experimental de la helicidad total.
Observación de los vórtices helicoidales estirados o comprimidos.
Análisis de la evolución del vórtice helicoidal aislado.

Principales resultados:

La helicidad total se conservó para los vórtices helicoidales estirados o comprimidos por otro vórtice.
Los vórtices helicoidales aislados evolucionaron y mantuvieron un estado de helicidad constante.
La viscosidad disipó la helicidad de torsión, pero la helicidad total se mantuvo constante.

Conclusiones:

La helicidad se puede conservar en fluidos viscosos, contrariamente a algunas expectativas.
Estos hallazgos mejoran la comprensión y la manipulación de la helicidad en los flujos de fluidos del mundo real.

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