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首页> 外文期刊>Journal of heat transfer: Transactions of the ASME >Plume dynamics in natural convection in a horizontal cylindrical annulus
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Plume dynamics in natural convection in a horizontal cylindrical annulus

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摘要

Measurements of the unsteady temperature fluctuations in the plume region between differentially heated horizontal concentric cylinders are reported. In particular, power spectral density estimates of the temperature fluctuations within the plumeshow the development and breakdown of the oscillatory plume structure at high Rayleigh number, Ra{sub}d, by two relatively independent processes: (1) the development of harmonic oscillations related to the dominant plume oscillation frequency, and (2)interactions between the oscillating plume and the adjacent relatively stagnant core flow (shear and entrainment). The harmonic oscillations are shown to be the dominant energy transfer mode at moderate Ra{sub}d (up to Ra{sub}d=10{sup}8), acting todisperse the plume energy without generating a broadband spectrum. The spectral density estimates show that while a distinct plume oscillation is still present near the inner cylinder at Ra{sub}d=10{sup}9, the plume becomes increasingly turbulent as theouter cylinder is approached. A new correlation for the plume oscillation frequency, which is found to be proportional to Ra{sub}d{sup}0.5, is also presented.

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