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Una nueva arruga en las láminas líquidas: Invirtiendo el mecanismo de colapso de la burbuja viscosa

Alexandros T Oratis¹, John W M Bush², Howard A Stone³

¹Department of Mechanical Engineering, Boston University, Boston, MA 02215, USA.

Science (New York, N.Y.)

|August 9, 2020

Resumen

La gravedad no causa el colapso de burbujas viscosas o arrugas; la tensión superficial impulsa estos fenómenos. Este hallazgo sugiere que las arrugas pueden ocurrir en películas pequeñas y curvas, lo que afecta a la producción de aerosoles.

Área de la Ciencia:

Dinámica de fluidos
Reología
Ciencias de la superficie

Sus antecedentes:

Las burbujas viscosas muestran colapso y arrugas, fenómenos anteriormente atribuidos al peso de la película.
Estas características se asocian típicamente con el comportamiento de la hoja elástica.

Objetivo del estudio:

Para investigar experimentalmente las fuerzas motrices detrás del colapso de la burbuja viscosa y las arrugas.
Determinar el papel del peso de la película y la gravedad en estos procesos.

Principales métodos:

Observación experimental del colapso y arrugas de las burbujas viscosas.
Variación de la orientación de la burbuja para evaluar la influencia de la gravedad.

Principales resultados:

El colapso de la burbuja y las arrugas ocurren independientemente de la orientación de la burbuja, lo que indica un papel insignificante de la gravedad.
Se identificó la tensión superficial como el principal impulsor del colapso de la burbuja y la inestabilidad dinámica de la curvatura.

Conclusiones:

El peso de la película no es responsable del colapso de las burbujas viscosas o de las arrugas.
La tensión superficial impulsa la inestabilidad dinámica de la curvatura en las películas viscosas.
Las arrugas pueden acompañar a la ruptura de películas viscosas curvas a pequeña escala, relevantes para la producción de aerosoles respiratorios.

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