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Transición de flujos turbulentos a flujos coherentes en fluidos activos tridimensionales confinados
Kun-Ta Wu1, Jean Bernard Hishamunda1, Daniel T N Chen1
1Department of Physics, Brandeis University, 415 South Street, Waltham, MA 02453, USA.
Science (New York, N.Y.)
|March 25, 2017
Resumen
Los fluidos activos hechos de microtúbulos y motores moleculares pueden fluir de forma autónoma a través de largos canales sin presión externa. Este avance permite el control de la dinámica de fluidos para máquinas blandas auto-organizadas.
Área de la Ciencia:
- La biofísica
- Física de la materia blanda
- Microfluidos
Sus antecedentes:
- El transporte de fluidos es crucial tanto para máquinas a gran escala como para dispositivos microfluídicos.
- Los fluidos convencionales requieren presión externa para el flujo, lo que limita los sistemas autónomos.
- Los sistemas de materia activa ofrecen nuevas posibilidades para la dinámica de fluidos autoorganizada.
Objetivo del estudio:
- Para demostrar el flujo autónomo de fluidos en canales de un metro de largo utilizando materia activa.
- Establecer el control sobre la magnitud, el perfil de velocidad y la dirección de los flujos auto-organizados.
- Investigar la transición del flujo turbulento al flujo coherente en fluidos activos confinados.
Principales métodos:
- Utilizando un fluido isotrópico activo compuesto de microtúbulos y motores moleculares.
- La ingeniería de canales tridimensionales de un metro de largo para el transporte de fluidos.
- Correlación de las características de flujo con la estructura de los haces de microtúbulos.
Principales resultados:
- Se logró el flujo autónomo de fluidos en canales de un metro de largo.
- Se estableció el control de la magnitud del flujo, el perfil de velocidad y la dirección.
- Un criterio invariante de escala rige la transición del flujo turbulento al coherente basado en la geometría del canal y el orden del paquete.
Conclusiones:
- Los fluidos isotrópicos activos pueden fluir de forma autónoma y ser controlados dentro de geometrías confinadas.
- El estudio revela una nueva transición de no equilibrio en fluidos activos confinados.
- Esta investigación allana el camino para la ingeniería de máquinas blandas auto-organizadas.
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