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首页> 外文期刊>International Journal of Heat and Mass Transfer >Cooling power and characteristic times of composite heatsinks and insulants
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Cooling power and characteristic times of composite heatsinks and insulants

机译：复合散热器和绝缘材料的冷却能力和特征时间

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摘要

Thermal energy storage materials for transient thermal management applications must exhibit large energy storage densities as well as large cooling/heating power densities. The latter property has proven difficult to quantify on a materials basis because it depends on extrinsic effects. Here, we apply a previously defined cooling power figure of merit, a measure of a material's intrinsic capacity to absorb a transient heat pulse, to analyze composite phase change material heatsinks and insulants. The results demonstrate important limits on the effects of high- and low-conductivity component volume fractions, orientations, and the critical lengthscales of individual components. Champion composites are predicted to have up to 5 times greater figure of merit than pure high-conductivity materials and up to 30 times greater figure of merit than pure phase change materials. Furthermore, composites consisting of insulating materials containing dispersed phase change materials are predicted to exhibit an order of magnitude increase in their characteristic response time. These results demonstrate the utility of the cooling power figure of merit to design compact high power and energy density heatsink and insulant materials.
机译：用于瞬态热管理应用的热能存储材料必须具有大的能量存储密度以及大的制冷/制热功率密度。事实证明，后一种性质很难以材料为基础进行量化，因为它取决于外部效应。在这里，我们采用了先前定义的冷却功率因数，即衡量材料吸收瞬态热脉冲的固有能力的指标，以分析复合相变材料的散热器和绝缘材料。结果表明，对高电导率和低电导率的组分体积分数，取向和单个组分的临界长度尺度的影响具有重要限制。预计冠军复合材料的品质因数比纯高电导率材料高5倍，品质因数比纯相变材料高30倍。此外，预计由包含分散相变材料的绝缘材料组成的复合材料的特征响应时间将显示出数量级的增加。这些结果证明了冷却功率因数在设计紧凑的高功率和能量密度散热器和绝缘材料方面的实用性。

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