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PIV investigation of buoyant plume from natural convection heat transfer above a horizontal heated cylinder

机译:PIV研究水平加热圆筒上方自然对流传热产生的浮羽

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This paper presents the results of an experimental investigation of the characteristics of the velocity field above an uniformly heated horizontal cylinder (outer diameter 54 mm) in water. Mean and fluctuating velocity fields are presented for a range of Rayleigh numbers from 2.05E7 to 7.94E7. Circumferential Nus-selt number distributions are also presented. Velocity data is compared with existing similarity solutions for turbulent plumes. The flow is initially laminar around the cylinder and undergoes a transition to turbulent flow a distance above the cylinder. The point where transition from laminar to turbulent flow initiates travels upstream towards the cylinder for increasing Rayleigh number.
机译:本文介绍了在水中均匀加热的水平圆柱体(外径54 mm)上方速度场特性的实验研究结果。给出了瑞利数范围从2.05E7到7.94E7的平均速度场和脉动速度场。还给出了周向Nus-selt数分布。将速度数据与湍流羽流的现有相似性解决方案进行比较。流动最初是围绕圆柱体的层流,并经历了到圆柱体上方一定距离处的湍流过渡。从层流过渡到湍流的起始点向上游流向圆柱,以增加瑞利数。

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