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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical investigation of heat transfer characteristics of impinging synthetic jets with different waveforms
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Numerical investigation of heat transfer characteristics of impinging synthetic jets with different waveforms

机译：不同波形撞击合成射流传热特性的数值研究

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摘要

Synthetic jet, potentially useful in electronic cooling, is numerically studied considering various waveforms for the purpose of heat transfer enhancement and compare to the corresponding steady air jet. In the present study, sinusoidal, rectangular and triangular synthetic jets are applied to a confined two-dimensional slot jet impinging on a heated plate adopting SST/k-ωturbulence model. The jet frequency is varied from 10 to 400 Hz for Reynolds numbers (Re) in the range of 1553–7766 (Strouhal number 0.012 ≤ St ≤ 2.4) and jet-to-surface distances ranging from 2 to 8. Generally, the cooling performance is enhanced by increase inReand with the increase in frequency andH/W, the cooling performance shows a first increase and then decrease trend. Results of simulation indicate that conditions at the turning frequency correspond to criticalSt = 0.24–0.48 have higher heat transfer rate than other cases at the sameRe. WhenSt < 0.06, the heat transfer performance of rectangular jets can be better than the other two jets. WhenStis close to the criticalSt, the comparison of heat transfer enhancement is that triangular jets > sinusoidal jets > rectangular jets. Time sequence of streamline and velocity contour image is presented to further explain this phenomenon. Moreover, most conditions show good heat transfer enhancement compare to the corresponding steady jet except conditions in whichStis too high (St > 1.2) orH/Wis too low, orH/Wis too large (H/W = 2 orH/W = 8). The maximum heat transfer enhancement coefficient of synthetic jets is found to be 74.7% higher than that of the corresponding steady jet.
机译：为了提高传热的目的，考虑了各种波形，对可能在电子冷却中有用的合成射流进行了数值研究，并与相应的稳定空气射流进行了比较。在本研究中，采用SST /k-ω湍流模型，将正弦，矩形和三角形合成射流应用于撞击在加热板上的有限二维缝隙射流。雷诺数（Re）在1553–7766（斯托洛哈尔数0.012≤St≤2.4）范围内，射流频率从10到400 Hz不等，射流到表面的距离在2到8之间。通常，冷却性能随着频率和H / W的增加，制冷量增加，冷却性能呈现先升​​高后降低的趋势。仿真结果表明，在相同的Re条件下，转弯频率对应的临界St critical = 0.24-0.48条件下的传热率高于其他情况。当St <0.06时，矩形射流的传热性能会优于其他两个射流。当Stis接近临界St时，传热增强的比较是三角形射流→正弦射流→矩形射流。提出了流线图和速度轮廓图的时间序列，以进一步解释这种现象。而且，除了Stis过高（St＞ 1.2）或H / Wis过低，或H / Wis过大（H / W ＝ 2或H / W ＝ 8）的情况之外，与相应的稳定射流相比，大多数情况显示出良好的传热增强。发现合成射流的最大传热增强系数比相应的稳定射流高74.7％。

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