A numerical analysis of transitional natural convection from a confined thermal source is presented. The system considered is an air-filled, square-sectioned 2D enclosure containing a horizontal heated cylinder. The resulting flow is investigated with respect to the variation of the Rayleigh number, for three values of the aspect ratio A. The first bifurcation of the low-Ra fixed-point solution is tracked for each A-value. Chaotic flow features are detailed for the case A = 2.5. The supercritical behaviour of the system is investigated using nonlinear analysis tools and phase-space representations, and the effect of the flow on heat transfer is discussed.

Bifurcations of Natural Convection Flows from an Enclosed Cylindrical Heat Source / Angeli, Diego; A., Pagano; Corticelli, Mauro Alessandro; A., Fichera; Barozzi, Giovanni Sebastiano. - In: FRONTIERS IN HEAT AND MASS TRANSFER. - ISSN 2151-8629. - ELETTRONICO. - 2:2(2011), pp. 1-9. [10.5098/hmt.v2.2.3003]

Bifurcations of Natural Convection Flows from an Enclosed Cylindrical Heat Source

ANGELI, Diego;CORTICELLI, Mauro Alessandro;BAROZZI, Giovanni Sebastiano
2011-01-01

Abstract

A numerical analysis of transitional natural convection from a confined thermal source is presented. The system considered is an air-filled, square-sectioned 2D enclosure containing a horizontal heated cylinder. The resulting flow is investigated with respect to the variation of the Rayleigh number, for three values of the aspect ratio A. The first bifurcation of the low-Ra fixed-point solution is tracked for each A-value. Chaotic flow features are detailed for the case A = 2.5. The supercritical behaviour of the system is investigated using nonlinear analysis tools and phase-space representations, and the effect of the flow on heat transfer is discussed.
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Bifurcations of Natural Convection Flows from an Enclosed Cylindrical Heat Source / Angeli, Diego; A., Pagano; Corticelli, Mauro Alessandro; A., Fichera; Barozzi, Giovanni Sebastiano. - In: FRONTIERS IN HEAT AND MASS TRANSFER. - ISSN 2151-8629. - ELETTRONICO. - 2:2(2011), pp. 1-9. [10.5098/hmt.v2.2.3003]
Angeli, Diego; A., Pagano; Corticelli, Mauro Alessandro; A., Fichera; Barozzi, Giovanni Sebastiano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/650435
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