Three-dimensional analysis of critical Rayleigh number for natural convection in a rectangular enclosure

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  • B241 密閉容器内自然対流の臨界レイリー数に関する 3 次元解析

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Numerical analysis has been carried out to investigate the behavior of 3D natural convection in a differentially heated rectangular enclosure with 8 height/width aspect ratio. Parameter study as a function of Rayleigh number has been performed to determine the critical Rayleigh number, which marks the transition from steady flows to time-periodic flows. As a result, it is revealed that 3D critical Rayleigh number is evaluated 4.0×10^5&le;Ra_c<6.0×10^5,which is higher than 2D critical Rayleigh number 2.9×10^5. The results indicate that 3D flows become more stable than 2D ones.

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