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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal Transport Analysis of Injected Flow through Combined Rib and Metal Foam in Converging Channels with Application in Electronics Hotspot Removal
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Thermal Transport Analysis of Injected Flow through Combined Rib and Metal Foam in Converging Channels with Application in Electronics Hotspot Removal

机译：通过组合肋和金属泡沫在换气通道中的热传输分析，用应用于电子热点移除

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摘要

The development of miniaturized and more powerful electronic devices and microprocessors has resulted in high heat generation and temperature values in these components. That affects the performance, reliability and lifespan of the devices. In addition, more local hot spots are generated in the components that require even more attention to prevent stress failure and fatigue. As such, the employment of advanced electronics cooling systems is very essential to keep the temperature below the safe temperature. In this work, innovative cooling systems are developed and analyzed employing jet impingement technology, high conductive metal foam, rib structured target surfaces, confined non-uniform small-scale channel, and conductive heat spreader plate. The base of the foam-filled cooling channel is subject to a uniform high heat flux value resembling the electronics device to be cooled. For numerical modeling of thermal transport through foam filled region, the local thermal non-equilibrium model in porous media is utilized resulting in two energy equations for solid and fluid phases. For better understanding of flow and thermal characteristics of jet impingement through the combination of metal foam and rib structured surfaces in confined channels, several effective parameters are studied such as slot and circular jet impingements, the shape and orientation of the ribs, impinging jet velocity, applied heat flux and the thickness of conductive heat spreader plate for hotspot removal. The results show that the fully foam filled channel provides a more efficient cooling in comparison with partially foam filled channel. Furthermore, the results indicate the advantage of utilization of ribs at the stagnation region of the impinging jet, for local thermal treatment of hotspots. The perpendicular cuboid ribs placed at the stagnation zone of the coolant jet impingement provide 13% increase in maximum local Nusselt number while the increase in the pressure drop and required pumping power are as small as 4.2%. Doubling the velocity would result in 35.3% increase in the maximum local Nusselt number, 180% increase in the pressure drop and 460.7% increase in the required pumping power. An increase in the thickness of the conductive heat spreader plate increases the base local temperature but improves local temperature uniformity.
机译：小型化和更强大的电子设备和微处理器的开发导致这些部件中的高发热和温度值。这影响了设备的性能，可靠性和寿命。此外，在需要更多地注意的组件中产生更多局部热点以防止应力失效和疲劳。因此，先进的电子冷却系统的就业对于保持低于安全温度的温度是至关重要的。在这项工作中，开发和分析了采用喷射冲击技术，高导电金属泡沫，肋条结构的目标表面，密闭的非均匀小规模通道和导电散热板的创新冷却系统。泡沫填充的冷却通道的底座受到类似于电子装置的均匀高热通量值。对于通过泡沫填充区域的热传输的数值建模，利用多孔介质中的局部热非平衡模型，得到用于固体和流体阶段的两个能量方程。为了通过限制通道中的金属泡沫和肋条结构表面的组合更好地理解喷射冲击的流动和热特性，研究了诸如槽和圆形喷射射击的若干有效参数，肋骨的形状和取向，撞击喷射速度，施加热通量和热点去除导电散热板的厚度。结果表明，与部分泡沫填充通道相比，完全泡沫填充通道提供更有效的冷却。此外，结果表明，在撞击射流的停滞区域中利用肋的优点，用于热点的局部热处理。放置在冷却剂射流冲击的停滞区处的垂直长方形肋提供13％的最大局部营养数增加，而压降和所需泵送功率的增加则小于4.2％。将速度加倍，将导致最大局部采用数量增加35.3％，压降增加180％，所需的泵送电量增加460.7％。导电散热板的厚度的增加增加了基础局部温度，但提高了局部温度均匀性。

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