Stabilization of unsteady convective flows by centrifugation
| Autor: | P Williams, A Chevy, S Bobeche, M Rodot |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Convection
Centrifuge Buoyancy Steady state Acoustics and Ultrasonics Chemistry Flow (psychology) Thermodynamics Mechanics engineering.material Condensed Matter Physics Temperature measurement Surfaces Coatings and Films Electronic Optical and Magnetic Materials Physics::Fluid Dynamics Acceleration engineering Streamlines streaklines and pathlines Physics::Atmospheric and Oceanic Physics |
| Zdroj: | Journal of Physics D: Applied Physics. 27:920-926 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | A liquid heated from below exhibits temperature fluctuations, characteristic of an unstable convection regime. When the liquid is placed in the acceleration field of a centrifuge, this convection regime is subjected to enhanced buoyancy, the Coriolis force and the acceleration gradient. Flow visualizations in water and temperature measurements in molten tin and molten germanium are presented, using the large arm centrifuge of the Laboratoire Central des Fonts et Chaussees at Nantes. The transition to a steady state at a certain acceleration threshold, as indicated by the suppression of temperature fluctuations in the three liquids, is accompanied by the formation of a single steady convective roll observed in the visualization experiment. This transition can be explained by the Coriolis force deflecting the flow streamlines into an organized structure. |
| Databáze: | OpenAIRE |
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