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Turbulence Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence Heat and Mass Transfer
September, 14-18, 2009, Rome, Italy

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf


ISBN Print: 978-1-56700-262-1

ISSN: 2377-2816

Dynamics of large-scale structures and heat transfer in turbulent mixed convection

page 4
DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.1400
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RESUMO

Low frequency oscillations have been observed in the heat transfer of mixed convection in a rectangular cavity with an aspect ratio of Γxz = 1 and Γyz = 5. Mixed convective flow at Ra = 2.4 × 108, Re = 1.0 × 104, Ar = 3.3 and Pr ≈ 0.7 has been studied to determine the nature of these oscillations. Therefore Particle Image Velocimetry (PIV) and temperature measurements have been performed under ambient and high pressure conditions. The PIV results have been analysed using Proper Orthogonal Decomposion (POD) to identify the characteristic frequencies of the coherent large-scale structures and their dynamics have been compared with the low frequency oscillations found in the heat transfer.

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