Compared to traditional continuous jets, synthetic jets (jets with oscillatory flow such that the time-average velocity is zero) have specific advantages, such as lower power requirement, simpler structure and the ability to produce an unsteady turbulent flow that is known to be effective in augmenting heat transfer. This study presents experimental and computational results that document heat transfer coefficients associated with impinging a synthetic jet flow onto the tip region of a longitudinal fin used in an electronics cooling system. The effects of different parameters, such as amplitude and frequency of diaphragm movement and jet-to-cooled-surface spacing, are recorded. The computational results show a good match with experimental results. In the experiments, an actual-scale (1 mm jet orifice) system is introduced and, for finer spatial resolution and improved control over geometric and operational conditions, a large-scale mock-up (44 mm jet orifice) is applied in a dynamically-similar way, then tested. Results of the experiments at the two scales, combined with the computational results, describe fin heat transfer coefficients on and near the jet impingement stagnation point. A linear relationship for heat transfer coefficient versus frequency of diaphragm movement is shown. Heat transfer coefficient values as high as 650 W/m²K are obtained with high-frequency diaphragm movement. Cases with different orifice shapes show how jet impingement cooling performance changes with orifice shape.

与传统的连续射流相比，合成射流（振荡流的时间平均速度为零的射流）具有特定的优势，例如更低的功率需求，更简单的结构以及产生不稳定的湍流的能力，这是已知有效的。在增加热传递方面。这项研究提出了实验和计算结果，这些结果记录了与将合成射流撞击到电子冷却系统中使用的纵向散热片的尖端区域相关的传热系数。记录不同参数的影响，例如隔膜移动的幅度和频率以及喷射到冷却的表面间距。计算结果与实验结果吻合良好。在实验中，引入了实际尺寸（1毫米射流孔）系统，并且 为了获得更好的空间分辨率并改善对几何和操作条件的控制，以动态相似的方式应用了大型模型（44毫米射流孔），然后进行了测试。在两个尺度上的实验结果与计算结果相结合，描述了射流冲击停滞点及其附近的鳍片传热系数。示出了传热系数与膜片运动频率之间的线性关系。传热系数值高达650 W / m 描述了射流冲击停滞点及其附近的鳍片传热系数。示出了传热系数与膜片运动频率之间的线性关系。传热系数值高达650 W / m 描述了射流冲击停滞点及其附近的鳍片传热系数。示出了传热系数与膜片运动频率之间的线性关系。传热系数值高达650 W / m² K的高频隔膜运动获得。孔形状不同的情况表明，射流冲击冷却性能如何随孔形状而变化。