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首页> 外文期刊>International Journal of Heat and Mass Transfer >Transition to an unsteady flow induced by a fin on the sidewall of a differentially heated air-filled square cavity and heat transfer
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Transition to an unsteady flow induced by a fin on the sidewall of a differentially heated air-filled square cavity and heat transfer

机译：过渡到由差异加热的充气方腔的侧壁上的鳍片引起的不稳定流动并进行传热

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摘要

The transition from a steady to an unsteady flow induced by an adiabatic fin on the sidewall of a differentially heated air-filled cavity is numerically investigated. Numerical simulations have been performed over the range of Rayleigh numbers from Ra = 10~5-10~9. The temporal development and spatial structures of natural convection flows in the cavity with a fin are described. It has been demonstrated that the fin may induce the transition to an unsteady flow and the critical Rayleigh number for the occurrence of the transition is between 3.72 × 10~6 and 3.73 × 10~6. Furthermore, the peak frequencies of the oscillations triggered by different mechanisms are obtained through spectral analysis. It has been found that the flow rate through the cavity with a fin is larger than that without a fin under the unsteady flow, indicating that the fin may improve the unsteady flow in the cavity.
机译：数值研究了由绝热翅片在差热式充气腔侧壁上引起的从稳态到非稳态的过渡。在瑞利数从Ra = 10〜5-10〜9的范围内进行了数值模拟。描述了带有翅片的空腔中自然对流流动的时间发展和空间结构。已经证明，鳍片可能引起过渡到非恒定流，并且发生过渡的临界瑞利数在3.72×10〜6和3.73×10〜6之间。此外，通过频谱分析获得了由不同机制触发的振荡的峰值频率。已经发现，在不稳定流动下，具有翅片的腔体的流率大于没有翅片的腔体的流率，这表明翅片可以改善腔体中的不稳定流率。

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