Design Optimization of an Aluminum-Pentane Grooved Heat Pipe Embedded in a Device Wall

S. Saygan, Emre Esen, Yigit Akkus
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Abstract

Two-phase passive heat spreaders are widely utilized in component-level thermal management. Among them, grooved heat pipes play a vital role especially in the applications where the waste heat needs to be transferred to the heat sinks positioned far away from the heat sources such as the thermal management of satellites. Capillary pumping scales with the extent of the variation of the edge angle, which is the angle of the three-phase contact line with the groove wall. Consequently, the contact angle of the working fluid with the heat pipe material determines the overall performance of the heat pipe. In this work, we first measure the contact angle of n-pentane on Al6063-T6 substrates with varying surface roughness values, which are all relevant to engineering applications as well as common surface finishes of various machining processes. Selection of the working fluid and container material is made based on the reported compatibility of the solid-fluid couple as well as the non-toxicity of the fluid. After the measurement of the contact angles, a recently developed heat pipe performance evaluation software Heat-Pipe Analysis Toolbox (H-PAT) is utilized to generate the performance curves corresponding to different groove geometries. Investigated groove geometries are selected based on the criteria of lightness, machin-ability, and mechanical strength. Finally, optimum geometries are determined for the application of interest.
铝-戊烷槽热管嵌入器件壁的优化设计
两相无源散热器广泛应用于部件级热管理。其中,槽式热管发挥着至关重要的作用,特别是在需要将废热转移到远离热源的散热器的应用中,例如卫星的热管理。毛细泵送随边缘角(即三相接触线与槽壁的夹角)的变化程度而变化。因此,工作流体与热管材料的接触角决定了热管的整体性能。在这项工作中,我们首先测量了不同表面粗糙度值的Al6063-T6基板上正戊烷的接触角,这些表面粗糙度值都与工程应用以及各种加工工艺的常见表面光洁度有关。工作流体和容器材料的选择是基于所报道的固体-流体偶联的相容性以及流体的无毒性。接触角测量完成后,利用最新开发的热管性能评估软件heat - pipe Analysis Toolbox (H-PAT)生成不同凹槽几何形状对应的热管性能曲线。所研究的凹槽几何形状是根据重量、机加工能力和机械强度的标准来选择的。最后,确定了应用感兴趣的最佳几何形状。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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