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首页> 外文期刊>Journal of Heat Transfer >An Experimental and Computational Heat Transfer Study of Pulsating Jets
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An Experimental and Computational Heat Transfer Study of Pulsating Jets

机译：脉动射流的实验与计算传热研究

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摘要

Synthetic jets are meso or microscale fluidic devices, which operate on the "zero-net-mass-flux" principle. However, they impart a positive net momentum flux to the external environment and are able to produce the cooling effect of a fan sans its ducting, reliability issues, and oversized dimensions. The rate of heat removal from the thermal source is expected to depend on the location, orientation, strength, and shape of the jet. In the current study, we investigate the impact of jet location and orientation on the cooling performance via time-dependent numerical simulations and verify the same with experimental results. We firstly present the experimental study along with the findings. Secondly, we present the numerical models/results, which are compared with the experiments to gain the confidence in the computational methodology. Finally, a sensitivity evaluation has been performed by altering the position and alignment of the jet with respect to the heated surface. Two prime orientations of the jet have been considered, namely, perpendicular and cross jet impingement on the heater. It is found that if jet is placed at an optimum location in either impingement or cross flow position, it can provide similar enhancements.
机译：合成射流是中观或微型射流装置，其以“零净质量通量”原理运行。但是，它们会给外部环境带来正的净动量通量，并且能够在不影响其风道，可靠性问题和尺寸过大的情况下产生风扇的冷却效果。从热源中去除热量的速度应取决于射流的位置，方向，强度和形状。在当前的研究中，我们通过与时间有关的数值模拟研究射流位置和方向对冷却性能的影响，并通过实验结果进行验证。我们首先介绍实验研究结果。其次，我们提出了数值模型/结果，将其与实验进行比较，以获得对计算方法的信心。最后，通过改变射流相对于加热表面的位置和对齐方式进行了灵敏度评估。已经考虑了射流的两个主要取向，即垂直和交叉射流撞击在加热器上。发现如果将射流放置在撞击位置或错流位置的最佳位置，它可以提供类似的增强效果。

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