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Numerical investigation of heat transfer performance of synthetic jet impingement onto dimpled/protrusioned surface

机译：合成射流撞击凹凸表面的传热性能的数值研究

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Dynamic mesh methods and user defined functions are adopted and the shear stress transport k-ω turbulent model has been used in the numerical investigation of heat transfer performance of synthetic jet impingement onto dimple/protrusioned surface. The results show that the local time-averaged Nusselt number of the dimpled/protrusioned target surface tends to be much closer with that of flat cases with increasing of frequency. The heat transfer performance gets better when frequency increases. The area-averaged time-averaged Nusselt number of protrusioned target surface is the most close to that of flat cases when f = 320 Hz while it is the smallest among the synthetic jet cases in dimpled target surface. The heat transfer enhancement performance of synthetic jet is 30 times better than that of natural convection. The time-averaged Nusselt number of stagnation point in the protrusioned target surface is higher than that of flat target surface while it is lower in the dimpled surface than that of flat surface no matter in the synthetic jet, steady jet or natural convection cases. Meanwhile, the timeaveraged Nusselt number of stagnation point in the synthetic jet cases increases with the increasing of frequency. It is worth pointing out that the time-averaged Nusselt number of stagnation point is lower than that of steady cases when the frequency is low. However, it shows a bit higher than that of steady cases when f = 320 Hz.
机译：采用动态网格方法和用户定义的函数，并将剪切应力传递k-ω湍流模型用于合成射流撞击到凹坑/凸出表面的传热性能的数值研究。结果表明，随着频率的增加，凹形/凸出目标表面的局部时间平均努塞尔数趋于与平坦情况下的局部平均时间接近。当频率增加时，传热性能变得更好。当f = 320 Hz时，突出目标表面的面积平均时间平均努塞尔数最接近平坦情况，而在凹陷目标表面的合成射流情况中，最小。合成射流的传热增强性能是自然对流的30倍。无论在合成射流，稳定射流还是自然对流情况下，突出目标表面的时滞点的平均Nusselt值均比平坦目标表面的滞后点的平均时间高，而凹坑表面中的滞后点的平均时间则比平坦表面的滞后点低。同时，合成射流情况下的时滞平均Nusselt数随频率的增加而增加。值得指出的是，滞后点的时间平均努塞尔特数低于频率低时的稳定情况。但是，它显示出比f = 320 Hz时的稳定情况高一些。

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