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Flotando bajo un líquido levitante
Benjamin Apffel1, Filip Novkoski1, Antonin Eddi2
1ESPCI Paris, PSL University, CNRS, Institut Langevin, Paris, France.
Nature
|September 4, 2020
Resumen
La agitación vertical puede estabilizar grandes capas de líquido, desafiando la gravedad. Este método también crea flotabilidad invertida, permitiendo que los objetos floten boca abajo en el líquido
Área de la Ciencia:
- Dinámica de fluidos
- Dinámica no lineal
- Física de las superficies
Sus antecedentes:
- Las capas líquidas generalmente colapsan debido a la inestabilidad de Rayleigh-Taylor inducida por la gravedad cuando se colocan sobre medios menos densos.
- La agitación vertical es un método establecido para estabilizar líquidos a través del promedio dinámico de la gravedad efectiva.
Objetivo del estudio:
- Investigar la estabilización de grandes capas de líquido utilizando la excitación por resonancia de la capa de aire de soporte.
- Para explorar el fenómeno de la flotabilidad invertida y la flotación de objetos boca abajo en capas líquidas levitantes.
- Predecir teóricamente y verificar experimentalmente las condiciones de los flotadores invertidos estables.
Principales métodos:
- Instalación experimental que utiliza la excitación por resonancia de una capa de aire para soportar grandes volúmenes de líquido (hasta 0,5 L, 20 cm de ancho).
- Modelado teórico para predecir la excitación mínima requerida para estabilizar los flotadores invertidos en función de su masa.
- Observación experimental y verificación de la caída selectiva de cuerpos pesados.
Principales resultados:
- Levitaba con éxito grandes capas de líquido excitando la capa de aire de soporte.
- Se ha demostrado la creación de posiciones estables de flotabilidad invertida en la interfaz inferior del líquido.
- Confirmado que la sacudida vertical puede invertir la fuerza gravitacional efectiva para los objetos en la interfaz inferior.
- Predicciones teóricas validadas para la excitación mínima requerida para mantener los flotadores invertidos.
Conclusiones:
- La agitación vertical, a través de la excitación por resonancia, permite la levitación de grandes volúmenes de líquido.
- Esta técnica crea configuraciones estables contraintuitivas donde los objetos pueden flotar boca abajo.
- Los hallazgos desafían la comprensión convencional de los fenómenos interfaciales y la flotabilidad.
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