405 熱流束振動を加えた矩形容器内熱対流場の内部重力波共鳴(G.S.伝熱,九州支部第58期総会・講演会)

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In this paper, the thermal convection field and its resonance phenomena in a rectangular cavity with sinusoidal heat-flux vibration were numerically examined. As angular velocity ω is changed, the thermal convection field at Pr=0.71, Ra=10^5 is found to be classified into 5 regions and, particularly, the field has the local maximum of relative amplitued of midplane Nusselt's number at ω_c=140, which corresponds to the angular velocity of internal gravity wave ω_r estimated by a theoretical equation proposed by Thorpe. This shows the local enhancement is induced by an internal gravity wave resonance. Such correspondence is observed for Ra≥10^5, Ra≥10^6 for Pr=0.71, 7.1, respectively. For the range of Ra we proposed a correlation equation to estimate the resonant angular velocity which is a function of Pr and Gr only.
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