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Reología: licuefacción de arenas movedizas bajo tensión
A Khaldoun1, E Eiser, G H Wegdam
1Van der Waals-Zeeman Institute, 1018 XE Amsterdam, The Netherlands.
Nature
|September 30, 2005
Resumen
Las arenas movedizas atrapan a las víctimas licuándose y colapsando cuando son perturbadas. Sin embargo, los seres humanos no pueden sumergirse completamente en las arenas movedizas debido a la flotabilidad, lo que hace imposible el hundimiento completo.
Área de la Ciencia:
- Geología Geología Geología.
- Física Física es la física de las cosas.
- Dinámica de fluidos La dinámica de fluidos.
Sus antecedentes:
- Las arenas movedizas son un fluido no newtoniano de origen natural.
- La comprensión previa sugería que las arenas movedizas podrían sumergir completamente a las personas.
Objetivo del estudio:
- Para investigar los mecanismos físicos detrás del comportamiento de captura de las arenas movedizas.
- Para determinar hasta qué punto una persona o un animal puede hundirse en las arenas movedizas.
Principales métodos:
- Condiciones de arenas movedizas simuladas en un entorno de laboratorio.
- Se utilizaron mediciones de densidad y viscosidad.
- Se realizaron pruebas de hundimiento con diferentes densidades.
Principales resultados:
- Las arenas movedizas exhiben propiedades de adelgazamiento de corte, licuándose bajo estrés.
- El material entonces pasa por una fase de colapso, aumentando la resistencia.
- La flotabilidad evita la sumersión completa; la profundidad máxima de hundimiento es limitada.
Conclusiones:
- La inestabilidad de las arenas movedizas al movimiento causa la atrapamiento.
- Los seres humanos y los animales no pueden ser completamente atraídos por las arenas movedizas.
- La comprensión de estas propiedades es clave para la interacción segura con los entornos de arenas movedizas.
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