Local hotspot thermal management improved by ionic wind generator coupled with porous materials
Local hotspot thermal management improved by ionic wind generator coupled with porous materials
复制标题
离子风力发电机与多孔材料相结合改善了局部热点热管理
DOI：
10.1016/j.ijthermalsci.2022.107878
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发表时间：
2023
影响因子：
4.5
通讯作者：
Ming-Yang You
中科院分区：
文献类型：
--
作者：
Tian-Hu Wang;Bin Shen;Hang Zhao;Liang Wang;Ming-Yang You
离子风是由极间极不均匀电场引起的电晕放电产生的。离子风技术具有体积小、节能、设计灵活、易于集成等优点，在提高热点冷却性能方面具有很大的潜力，特别是对于小型电子设备。然而，由于有限的传热面积和低的空气热导率，朝向高功率密度的热移除能力相对较低。局部热点冷却的原理和设计仍然缺乏。在这里，一个离子风力发电机与一个新的架构耦合多孔介质被认为是提高冷却性能。结果表明，当多孔介质块耦合时，由于多孔块中的改性的传热和传质，传热可以显着增强。研究还发现电极结构对器件性能有显著影响。在设备中的传热面积和气流阻碍之间存在折衷。多孔块的几何形状和性能参数对冷却性能有着决定性的影响，而冷却性能的改善是通过改变多孔结构来实现的。在此基础上，提出了一种采用多孔翅片耦合热沉的离子风发生器，并通过优化设计参数进一步提高了其性能。优化后的散热器结构可以在90 kW/m2的热流密度下将冷却表面的最高温度保持在83.2 °C以下。该研究为热点区域的空气侧热管理提供了一种新的思路。研究结果有助于深入理解多孔介质中电液动力诱导气流的传热过程，为设计性能更好的离子风发电机提供了新的思路。
Ionic wind is induced by corona discharge caused by extremely inhomogeneous electric field between two electrodes. Due to its compact size, energy saving, flexible design, and easy integration, ionic wind technique exhibits great potential to improve hotspot cooling, especially for compact electronic devices. However, the heat removal capability towards high power density is relatively low due to the limited heat transfer area and low air thermal conductivity. The principle and designs are still lacking for local hotspot cooling. Here, an ionic wind generator with a novel architecture coupled with porous medium is conceived to enhance cooling performance. It is demonstrated that when a porous medium block is coupled, heat transfer can be significantly boosted due to the modified heat and mass transfer in the porous block. It is also found that electrode configuration significantly influences the device performance. There is a trade-off between heat transfer area and airflow impediment in the device. The geometry and property parameters of the porous block are critical for the cooling performance, which is attributed to the modified flow field by changing porous structure. Based on this principle, another ionic wind generator improved by a coupled heat sink with porous fins is proposed, whose performance can be further enhanced by optimizing its design parameters. The optimized heat sink structure can maintain the max temperature of the cooling surface below 83.2 °C at a heat flux of 90 kW/m2. This study provides a promising way for air-side thermal management of hotspot. The findings are helpful for understanding EHD-induced airflow heat transfer in porous medium and shed new light on designing ionic wind generators with better performance.
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影响因子：
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作者：
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DOI：
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