The main mechanisms of transition of buoyancy-inducedflows in horizontal annuli are reviewed, based on the availableliterature. Both experimental and theoretical studies areconsidered. The different scenarios for the evolution of theflow regimes and temperature patterns are tracked, for increasingvalues of the Rayleigh number, Ra. The occurrenceof various instability and bifurcative phenomena is pointedout, and linked to other relevant parameters, such as the radiusratio, R and the Prandtl number, Pr. The effect of theaxial dimension is also considered. Finally, possible futureresearch issues on the subject are briefly hinted at.
A comprehensive review on buoyancy-induced flow transitions in horizontal annuli / Angeli, Diego; Barozzi, Giovanni Sebastiano; Corticelli, Mauro Alessandro. - STAMPA. - (2009), pp. 59-64. ((Intervento presentato al convegno XXVII congresso nazionale UIT sulla trasmissione del calore tenutosi a Reggio Emilia nel 22-24 giugno 2009.