Consider an air-filled square cavity with cold top and bottom walls, adiabatic side walls and a centered heated sharp-edged source (a square-section cylinder). An unstable behavior has been highlighted previously while studying the effects of confinement (with different cylinder sizes) on the topology of the flow. A transition occurs from a bi-dimensional, steady regime to a three-dimensional, unsteady regime when the aspect ratio reaches the value of 0.4 for a Rayleigh number of 5.74 × 104. Time-resolved 2D particle image velocimetry is used to characterize the dynamics of the flow in this configuration. The evolution of the instability is particularly investigated.
- Heat Transfer Division
Natural Convection Around a Horizontal Heated Square-Section Cylinder in an Enclosure: Visualization and Dynamic Characterization of Instabilities by Particle Image Velocimetry
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Leplat, G, Barricau, P, Reulet, P, & Millan, P. "Natural Convection Around a Horizontal Heated Square-Section Cylinder in an Enclosure: Visualization and Dynamic Characterization of Instabilities by Particle Image Velocimetry." Proceedings of the ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. Heat Transfer: Volume 3. Jacksonville, Florida, USA. August 10–14, 2008. pp. 637-644. ASME. https://doi.org/10.1115/HT2008-56219
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