Direct simulation of natural convection cooling in a vertical circular cylinder

Direct simulation of natural convection cooling in a vertical circular cylinder
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立式圆柱体自然对流冷却的直接模拟

DOI:
10.1016/s0017-9310(99)00074-5
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发表时间:
1999-11
期刊:
Int.J.Heat Mass Transfer
影响因子:
--
通讯作者:
S. W. Armfield
S. W. Armfield
中科院分区:
其他
文献类型:
--
作者:
Wenxian Lin;S. W. Armfield

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本文用数值方法研究了竖直圆柱内均匀流体自然对流冷却和分层的瞬态过程。通过对缸内瞬态演变过程的可视化,识别了缸内瞬态流型。结果表明,强流动主要集中在沿着侧壁的垂直热边界层和冷侵入流嵌入区域下部的水平区域。分析了非定常和准定常阶段的瞬态流态,包括沿侧壁沿着的垂直热边界层中的行波活动和水平区域中的冷侵入。采用尺度分析方法研究了圆柱体侧壁上垂直热边界层的发展和圆柱体内的分层现象。结果表明,数值解与标度结果吻合得很好。
The transient processes of cooling-down and stratifying an initially homogeneous fluid by natural convection in a vertical circular cylinder have been investigated numerically. The transient flow patterns are identified by the visualization of the transient evolving processes in the cylinder. The results show that vigorous flow activities concentrate mainly in the vertical thermal boundary layer along the sidewall and in the horizontal region which is the lower part of the domain where the cold intrusion flow is embedded. The transient flow patterns at the unsteady and quasi-steady stages are analysed, including the activities of the travelling waves in the vertical thermal boundary layer along the sidewall and the cold intrusions in the horizontal region. A scaling analysis is used to characterize the development of the vertical thermal boundary layer on the sidewall and the stratification in the cylinder. It is found that the numerical solutions agree very well with the scaling results.
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发表时间: 1997-12
影响因子: 3.7
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