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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Thermal radiators with embedded pulsating heat pipes: Infra-red thermography and simulations
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Thermal radiators with embedded pulsating heat pipes: Infra-red thermography and simulations

机译：带有嵌入式脉动热管的散热器：红外热成像和模拟

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摘要

With the aim of exploring potential applications of Pulsating Heat Pipes (PHP), for space/terrestrial sectors, experimental study of embedded PHP thermal radiators, having two different effective Biot numbers respectively, and subjected to conjugate heat transfer conditions on their surface, i.e., natural convection and radiation, has been carried out under different thermo-mechanical boundary conditions. High resolution infrared camera is used to obtain spatial temperature profiles of the radiators. To complement the experimental study, detailed 3D computational heat transfer simulation has also been undertaken. By embedding PHP structures, it was possible to make the net thermal resistance of the mild steel radiator plate equivalent to the aluminum radiator plate, in spite of the large difference in their respective thermal conductivities (k_(Al) ～ 4k_(MS)). The study reveals that embedded PHP structures can be beneficial only under certain boundary conditions. The degree of isothermalization achieved in these structures strongly depends on its effective Biot number. The relative advantage of embedded PHP is appreciably higher if the thermal conductivity of the radiator plate material itself is low. The study indicates that the effective thermal conductivity of embedded PHP structure is of the order of 400 W/mK to 2300 W/mK, depending on the operating conditions.
机译：为了探索脉冲热管（PHP）在空间/地面领域的潜在应用，对嵌入式PHP散热器的实验研究，该散热器分别具有两个不同的有效毕奥特数，并且在其表面上经受共轭传热条件，即自然对流和辐射是在不同的热机械边界条件下进行的。高分辨率红外摄像机用于获取散热器的空间温度曲线。为了补充实验研究，还进行了详细的3D计算传热模拟。通过嵌入PHP结构，尽管它们各自的热导率相差很大（k_（Al）〜4k_（MS）），但仍可以使低碳钢散热器板的净热阻与铝散热器板相等。研究表明，嵌入式PHP结构仅在某些边界条件下才是有益的。在这些结构中实现的等温度强烈取决于其有效比奥数。如果散热板材料本身的热导率较低，则嵌入式PHP的相对优势会更高。研究表明，取决于操作条件，嵌入式PHP结构的有效导热系数约为400 W / mK到2300 W / mK。

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