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Aceleraciones de partículas de fluidos en una turbulencia completamente desarrollada.

A La Porta1, G A Voth, A M Crawford

  • 1Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853-2501, USA.

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|March 10, 2001
PubMed
Resumen

Los investigadores midieron las aceleraciones de las partículas de fluidos en el flujo de agua turbulenta, confirmando la escala de Kolmogorov a altos números de Reynolds. Se encontró que las aceleraciones de partículas son muy intermitentes, alcanzando valores extremos.

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Área de la Ciencia:

  • Dinámica de fluidos La dinámica de fluidos.
  • Investigación de la turbulencia en la investigación de la turbulencia.
  • Física estadística de las estadísticas.

Sus antecedentes:

  • El movimiento de las partículas en flujos turbulentos es crucial para el transporte y la mezcla.
  • La comprensión de la aceleración de partículas de fluidos es clave para validar teorías de turbulencia como la escala de Kolmogorov de 1941.
  • Estudios anteriores se enfrentaron a desafíos para medir con precisión las aceleraciones de partículas.

Objetivo del estudio:

  • Para investigar experimentalmente las aceleraciones de partículas de fluidos en flujo turbulento.
  • Para probar la predicción de Heisenberg-Yaglom basada en la teoría de Kolmogorov.
  • Para cuantificar la intermitencia y la escala de las aceleraciones de partículas.

Principales métodos:

  • Utilizó un detector adaptado de la física de altas energías para rastrear partículas.
  • Realizó experimentos en un laboratorio de flujo de agua.
  • Logró números de Reynolds de hasta 63.000.

Principales resultados:

  • Escalado de Kolmogorov observado de la varianza de aceleración a altos números de Reynolds, dentro del error experimental.
  • Se encontró que las aceleraciones de partículas son muy intermitentes, con picos de hasta 1.500 veces la gravedad.
  • Se observó que los datos de aceleración reflejan la anisotropía del flujo a gran escala en todos los números de Reynolds probados.

Conclusiones:

  • Los resultados experimentales apoyan la teoría de escala de Kolmogorov para las aceleraciones de partículas de fluidos en turbulencia.
  • La extrema intermitencia de la aceleración pone de relieve una característica clave de los flujos turbulentos.
  • La anisotropía del flujo a gran escala influye en la aceleración de partículas en todas las escalas estudiadas.