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首页> 外文期刊>International Journal of Heat and Fluid Flow >Unsteady heat transfer from a circular cylinder for Reynolds numbers from 3000 to 15,000
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Unsteady heat transfer from a circular cylinder for Reynolds numbers from 3000 to 15,000

机译：雷诺数从3000到15,000的圆柱体传热不稳定

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摘要

Unsteady heat transfer from a circular cylinder to the cross-flow of air was investigated experimentally for Reynolds numbers from 3000 to 15,000. Fluctuating heat transfer on the cylinder surface was measured using a heat flux sensor, and time-spatial characteristics of the heat transfer were measured using an infrared thermograph. The present measurements showed that the alternating rolling-up of the shear layers that separated from the cylinder forms an alternating reattached flow at the rear of the cylinder in the range of Re > 5000-8000, due to the forward movement of the vortex formation region with increasing Reynolds number. This leads to a sharp increase in the time-averaged Nusselt number around the rear stagnation point of the cylinder. The heat transfer in the separated flow region has spanwise nonuniformity throughout the examined Reynolds number range. The wavelength of this nonuniformity corresponds to that of the streamwise vortices formed in the near-wake.
机译：对于3000到15,000的雷诺数，实验研究了从圆柱到空气错流的不稳定传热。使用热通量传感器测量气缸表面上的波动传热，并使用红外热像仪测量传热的时空特性。当前的测量结果表明，由于涡流形成区域的向前运动，与圆柱体分离的剪切层的交替卷起在圆柱体的后部形成了Re> 5000-8000范围内的交替重新附着流。随着雷诺数的增加。这导致圆柱体后停滞点附近的时间平均努塞尔数急剧增加。在整个检查的雷诺数范围内，分离的流动区域中的传热在翼展方向上均不均匀。这种不均匀性的波长对应于近尾流中形成的沿流涡旋的波长。

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