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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Natural convection heat transfer from two horizontal cylinders
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Natural convection heat transfer from two horizontal cylinders

机译：来自两个水平圆柱体的自然对流传热

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摘要

Natural convection heat transfer from a single horizontal cylinder and a pair of vertically aligned horizontal cylinders is investigated. Surface heat transfer distributions around the circumference of the cylinders are presented for Rayleigh numbers of 2 x 10(6), 4 x 10(6) and 6 x 10(6) and a range of cylinder spacings of 1.5, 2 and 3 diameters. With a cylinder pairing the lower cylinder is unaffected by the presence of the second cylinder; the same is true of the upper cylinder if the lower one is not heated. However, when both cylinders are heated it has been found that a plume rising from the heated lower cylinder interacts with the upper cylinder and significantly affects the surface heat transfer distribution. Spectral analysis of surface heat transfer signals has established the influence of the plume oscillations on the heat transfer. Thus, when the plume from the lower cylinder oscillates out of phase with the flow around the upper cylinder it increases the mixing and results in enhanced heat transfer. (C) 2008 Elsevier Inc. All rights reserved.
机译：研究了来自单个水平圆柱体和一对垂直排列的水平圆柱体的自然对流传热。给出了瑞利数为2 x 10（6），4 x 10（6）和6 x 10（6）以及圆柱体间距范围为直径1.5、2和3的圆柱体周围的表面传热分布。使用汽缸配对时，下汽缸不受第二汽缸的影响;如果下部气缸未加热，则上部气缸也是如此。然而，已经发现当两个气缸都被加热时，从加热的下部气缸升起的羽流与上部气缸相互作用并且显着影响表面热传递分布。表面传热信号的频谱分析已确定羽流振荡对传热的影响。因此，当来自下部气缸的羽流与围绕上部气缸的气流异相振荡时，它会增加混合并提高传热效果。 （C）2008 Elsevier Inc.保留所有权利。

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