Un interesante vídeo acerca del flujo laminar (laminar flow) que muestra a fluidos funcionando en capas. Lo explican perfectamente en la web de este experimento:
This apparatus is an effective and safe educational tool or conceptual aide that displays the properties of laminar flow. The apparatus is designed to for easy operations and cleaning and provides great visual, real-time display of laminar flow. Students and educators will enjoy using the apparatus while gaining valuable knowledge of fluid dynamics.
When a fluid (gas or liquid) flows in a defined manner with distinct paths it is said to be in laminar flow. Laminar flow is a fundamental physical phenomenon that occurs frequently in everyday life. However, the concept of laminar flow can sometimes be difficult to put into context when discussing fluid dynamics. Turbulent flow on the other hand may be a little easier to explain as the only requirement is that there is no order to the fluids fluctuations. When attempting to illustrate the properties associated with laminar flow this apparatus is most effective.
This apparatus allows for the visual examination of a fluid undergoing laminar flow. Initially, within the apparatus, various colored droplets are suspended in a fluid and all are in a state of equilibrium where the different fluids are distinctly separated. When the apparatus is rotated the fluids revolve in a controlled manner and the droplets seem to become completely intermixed yet still divided from the outer fluid. After several rotations the apparatus is then operated in the reverse direction. Since the Reynolds number within this apparatus is less then one, an almost complete reversal of the previous laminar flow is undertaken. The result is that after the same amount of rotations in the opposite direction, the droplets return to their initial, distinctly separated, forms.
Este aparato ha sido desarrollado por John DeMoss y Kevin Cahill del Departamento de Física y Astronomía de la Universidad de Nuevo México. Si alguien cree que puede darle el uso divulgativo que merece, en su web podemos comprar el aparato por unos módicos 450 dólares.
(vía SkeptTV)
