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.

Flow Transitions and Bifurcations of Buoyancy-induced Flows from an Enclosed Cyindrical Heat Source / Angeli, Diego; A., Pagano; Corticelli, Mauro Alessandro; Barozzi, Giovanni Sebastiano. - ELETTRONICO. - (2010), pp. IHTC14-22648-6. (Intervento presentato al convegno 14th International Heat Transfer Conference (IHTC14) tenutosi a Washington, DC, USA nel 8-13 august 2010) [10.1115/IHTC14-22648].

Flow Transitions and Bifurcations of Buoyancy-induced Flows from an Enclosed Cyindrical Heat Source

ANGELI, Diego;CORTICELLI, Mauro Alessandro;BAROZZI, Giovanni Sebastiano
2010

Abstract

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.
2010
14th International Heat Transfer Conference (IHTC14)
Washington, DC, USA
8-13 august 2010
IHTC14-22648
6
Angeli, Diego; A., Pagano; Corticelli, Mauro Alessandro; Barozzi, Giovanni Sebastiano
Flow Transitions and Bifurcations of Buoyancy-induced Flows from an Enclosed Cyindrical Heat Source / Angeli, Diego; A., Pagano; Corticelli, Mauro Alessandro; Barozzi, Giovanni Sebastiano. - ELETTRONICO. - (2010), pp. IHTC14-22648-6. (Intervento presentato al convegno 14th International Heat Transfer Conference (IHTC14) tenutosi a Washington, DC, USA nel 8-13 august 2010) [10.1115/IHTC14-22648].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/644350
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