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首页> 外文期刊>International Journal of Heat and Mass Transfer >Velocity measurements in the free convection flow above a heated horizontal cylinder
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Velocity measurements in the free convection flow above a heated horizontal cylinder

机译：加热的水平圆柱体上方自由对流中的速度测量

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摘要

The fluid dynamics of the free convection water flow above a heated horizontal cylinder were investigated using particle image velocimetry. Velocity measurements were obtained in three orthogonal planes, with each plane acquired independently in time. The experiment was performed for a Rayleigh number of 1.33 x 106 and for water heights above the cylinder surface of H/D = 1, 2, 4, 6, 8, and 12. The top water surface was open to room air, and the height of the free surface introduced different effects of vertical confinement. For all water heights studied, the plume above the cylinder and its interaction with the free surface were observed. For water heights of H/D = 4 and 6, the appearance of a swaying motion was captured in the plane perpendicular to the cylinder axis, and a meandering motion was detected in the other two orthogonal planes. A vortex was observed to form alongside of the plume and rise to the free surface, where it detached from the plume structure and moved along the free surface. Vortex dynamics and the physical characteristics of the swaying and meandering motions appeared to be interdependent, providing a possible relation between vortex formation, swaying, and meandering. Comparisons with previous analytical and experimental results highlight the complicated three-dimensional flow structure that governs heat transfer from the cylinder.
机译：使用颗粒图像测速仪研究了加热的水平圆柱体上方自由对流水流的流体动力学。在三个正交平面中获得速度测量值，每个平面在时间上独立获取。该实验的瑞利数为1.33 x 106，圆柱体表面上方的水高为H / D = 1、2、4、6、8和12。顶部水面通向室内空气，并且自由表面的高度引入了垂直限制的不同影响。对于所研究的所有水高，均观察到圆柱体上方的羽流及其与自由表面的相互作用。对于H / D = 4和6的水高，在垂直于圆柱轴的平面中捕获了摇摆运动的出现，而在其他两个正交平面中检测到了弯曲运动。观察到涡流在羽流的旁边形成并上升到自由表面，在那里它与羽流结构分离并沿着自由表面移动。涡旋动力学和摇摆和曲折运动的物理特性似乎是相互依存的，从而在漩涡形成，摇摆和曲折之间提供了可能的关系。与以前的分析和实验结果进行的比较表明，控制汽缸传热的复杂三维流动结构。

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