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.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4942-2
PROCEEDINGS PAPER
Flow Transitions and Bifurcations of Buoyancy-Induced Flows From an Enclosed Cylindrical Heat Source
Diego Angeli
,
Diego Angeli
Universita` degli Studi di Modena e Reggio Emilia, Modena, MO, Italy
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Arturo Pagano
,
Arturo Pagano
Universita` degli Studi di Catania, Catania, CT, Italy
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Mauro A. Corticelli
,
Mauro A. Corticelli
Universita` degli Studi di Modena e Reggio Emilia, Modena, MO, Italy
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Giovanni S. Barozzi
Giovanni S. Barozzi
Universita` degli Studi di Modena e Reggio Emilia, Modena, MO, Italy
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Diego Angeli
Universita` degli Studi di Modena e Reggio Emilia, Modena, MO, Italy
Arturo Pagano
Universita` degli Studi di Catania, Catania, CT, Italy
Mauro A. Corticelli
Universita` degli Studi di Modena e Reggio Emilia, Modena, MO, Italy
Giovanni S. Barozzi
Universita` degli Studi di Modena e Reggio Emilia, Modena, MO, Italy
Paper No:
IHTC14-22648, pp. 95-104; 10 pages
Published Online:
March 1, 2011
Citation
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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