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首页> 外文期刊>International Journal of Heat and Mass Transfer >Phase-change heat transfer of sintered-particle wick in downward facing orientation: Particle size and wick thickness effects
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Phase-change heat transfer of sintered-particle wick in downward facing orientation: Particle size and wick thickness effects

机译：烧结粒子芯的相变传热在向下面向方向上：粒度和芯厚度效应

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Two-phase cooling systems using wicks offer reliable and high heat flux cooling capability, however, the maximum heat removal capacity is related to capillary pumping limit and wick superheat. In this study, non-uniform wicks are examined to simultaneously enhance the capillary pumping limit and minimize wick superheat. The non-uniform wick consists of a thin evaporation wick for reducing the wick superheat and a thick coolant supply wick for enhancing the coolant supply. Also, it has a phase-separating wick attached to the coolant supply wick to ensure the vapor escape channels. The thin wick is fabricated using sintered-copper particles with 30-200 μm spherical particles, while the post and phase-separating wicks are constructed using 10 and 3 layers of 200 μm copper particles, respectively. To minimize the gravity-driven liquid supply, the liquid reservoir is placed below the wick structure, i.e., downward facing orientation. The heat flux is measured as a function of the wick superheat using different particles sizes and thicknesses of the thin wick, i.e., 30, 60, 100, 200, 60/200, and 100/200 μm with 1-3 layers. The results show that 60 μm particles result in the minimal wick superheat at q ＜ 100 W/cm~2 for 1 and 2 layers of the wick, while the 100/200 μm particles with 3 layers leads to the maximum heat flux of 223 W/cm~2, which is ～48% enhancement compared to the bare copper surface at the wick superheat of 38.6 °C. Also, it is found that the 2 and 3 layer wicks substantially decrease the wick superheat compared to the single layer wick, although the wick thickness (conductive thermal resistance) is larger. This is attributed to the 2 and 3 layer wick enhance the liquid supply, by increasing the cross-section area of the wick, thus, delaying the surface dryout.
机译：两相冷却系统采用芯片提供可靠和高热通量冷却能力，但最大的散热能力与毛细管泵限制和芯过热有关。在该研究中，检查非均匀的芯片以同时增强毛细管泵送限制并使灯芯过热。非均匀芯层由薄的蒸发芯组成，用于减少芯过热和厚冷却剂供应芯，用于增强冷却剂供应。而且，它具有连接到冷却剂供应芯的相位分离的芯，以确保蒸汽逃逸通道。使用具有30-200μm球形颗粒的烧结 - 铜颗粒制造薄芯，同时分别使用10和3层200μm铜颗粒构建后和相位分离的芯片。为了最小化重力驱动的液体供应，液体储存器被放置在芯骨结构下方，即向下面向方向。使用薄芯的不同颗粒尺寸和厚度的薄芯，即30,60,100,20,60 / 200和100/200μm，测量热通量的芯片过热测量，其中薄芯的尺寸和厚度为1-3层。结果表明，60μm颗粒导致Q <100W / cm〜2的最小芯片过热，1和2层芯，而具有3层的100/200μm颗粒导致223W的最大热通量/ cm〜2，与38.6℃的芯过热的裸铜表面相比，增强〜48％。而且，发现与单层芯相比，2和3层芯基本上减小了芯过热，尽管芯厚度（导电热阻）更大。这归因于2和3层芯通过增加芯的横截面区域来增强液体供应，从而延迟表面干燥。

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