This study presents a numerical analysis of the dynamics of transitional natural convection flow regimes, generated by a confined thermal source. The system considered is a 2D enclosure of square cross-section, containing a horizontal cylindrical source, placed in a central position. The heat carrier fluid is air with Prandtl number Pr = 0.7. The resulting flow is investigated with respect to the variation of the Rayleigh number, based on the minimum gap width H between the cylinder and the enclosure walls. Three values of the aspect ratio A are considered (A = 2.5, 3.3, 5). The first bifurcation of the low-Ra fixed-point solution is tracked for each A-value. The transition to unsteady, chaotic flow is detailed for A = 2.5. The supercritical behaviour of the system is investigated using nonlinear analysis tools and phase space representations of the computed time series.
- Heat Transfer Division
Flow Transitions and Bifurcations of Buoyancy-Induced Flows From an Enclosed Cylindrical Heat Source
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Angeli, D, Pagano, A, Corticelli, MA, & Barozzi, GS. "Flow Transitions and Bifurcations of Buoyancy-Induced Flows From an Enclosed Cylindrical Heat Source." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 7. Washington, DC, USA. August 8–13, 2010. pp. 95-104. ASME. https://doi.org/10.1115/IHTC14-22648
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