منابع مشابه
Hysteresis phenomenon in turbulent convection
Coherent large-scale circulations of turbulent thermal convection in air have been studied experimentally in a rectangular box heated from below and cooled from above using Particle Image Velocimetry. The hysteresis phenomenon in turbulent convectionwas found by varying the temperature difference between the bottom and the top walls of the chamber (the Rayleigh number was changed within the ran...
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The geometrically different plan forms of near wall plume structure in turbulent natural convection, visualised by driving the convection using concentration differences across a membrane, are shown to have a common multifractal spectrum of singularities for Rayleigh numbers in the range 10 − 10 at Schmidt number of 602. The scaling is seen for a length scale range of 2 and is independent of th...
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Résumé : Nous avons mesuré la fréquence de formation de panaches dans une expérience de convection thermique à Pr >>1. Comme la viscosité du fluide utilisé varie fortement avec la température, les couches limites chaude et froide ont différentes épaisseurs et viscosités. Ceci entraîne des fréquences différentes pour ces couches. Il semblerait qu’il y ait une interaction directe entre les couche...
متن کاملPlume fragmentation by bulk interactions in turbulent Rayleigh-Bénard convection.
Using compressed gases with Prandtl numbers near 0.7, we obtained flow visualizations of turbulent Rayleigh-Bénard convection in a cylindrical sample with an aspect ratio Γ≡D/L≅10 (D is the diameter and L the height) by the shadowgraph method. Focusing on the plumes under the top plate, we found that their length had a log-normal distribution, suggesting a fragmentation process. Fragmentation e...
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ژورنال
عنوان ژورنال: Science
سال: 1965
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.150.3695.509