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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Geometry and orientation effects in non-uniformly heated microchannel heat exchangers using supercritical carbon dioxide
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Geometry and orientation effects in non-uniformly heated microchannel heat exchangers using supercritical carbon dioxide

机译：使用超临界二氧化碳的非均匀加热微通道热交换器的几何和方向效应

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摘要

There is growing interest to use supercritical carbon dioxide (sCO(2)) as a working fluid in thermal management applications. This study investigates the thermal-hydraulic performance of microchannel heat sinks as a function of flow channel geometry and orientation at operating conditions representative of electronics cooling applications. Three different experimental test sections, subject to non-uniform heat flux boundary conditions, were investigated. Two of the test sections contained parallel arrays of rectangular microchannels with a hydraulic diameter of 750 mu m and aspect ratios of 1 and 2, respectively. The third test section had a staggered array of diamond shaped micro-pins with a hydraulic diameter, based on the minimum flow area, of 525.2 mu m. Data were collected for varying inlet temperature (16 <= T-in <= 50 degrees C), mass flux (315 <= G <= 1000 kg m(-2) s(-1)), and heat flux (20 <= q(n) <= 50 W cm(-2)) at a fixed reduced pressure (P-R) of 1.1. A data analysis method using 2-D and 3-D heat transfer models of the test sections was used to calculate the average heat transfer coefficients for each experimental condition. Additionally, a pressure drop model was developed to resolve the total measured pressure drop into its components. The results of this study indicate that the turbulent convective heat transfer was independent of orientation (top versus bottom heating) for square microchannel (aspect ratio = 1) for the conditions investigated. Increasing the channel aspect ratio from 1 to 2 led to an enhancement in thermal transport. Finally, the heat transfer performance of the staggered pin array flow geometry was superior to the rectangular channels, but this enhancement in heat transfer was commensurate with the increase in pressure drop. Based on these results, this paper concludes with general design recommendations for those considering the early adoption of supercritical carbon dioxide for thermal management applications.
机译：使用超临界二氧化碳（SCO（2））作为热管理应用中的工作流体，越来越感兴趣。本研究研究了微通道散热器的热液压性能作为电气通道几何形状和在代表电子冷却应用的操作条件下的定向的函数。研究了三种不同的实验试验部分，受不均匀的热通量边界条件的影响。两个测试部分分别包含矩形微通道的平行阵列，液压直径分别为750μm和1和2的纵横比。第三个试验部分具有基于525.2μm的最小流量面积的液压直径的交错阵列菱形微销。收集数据以进行不同的入口温度（16 <= T-in <= 50℃），质量通量（315 <= g <= 1000kg m（-2）s（-1））和热通量（20 < =在固定的减压（PR）为1.1的Q（n）<= 50W cm（-2））。使用测试部分的2-D和3-D传热模型的数据分析方法用于计算每个实验条件的平均传热系数。另外，开发了一种压降模型以将总测量的压力降解成其组分。该研究的结果表明，湍流对流传热与方形微通道（梯度比率= 1）的取向（顶部与底部加热）无关，用于研究的条件。增加从1到2的通道宽高比导致热传输的增强。最后，交错销阵列流几何形状的传​​热性能优于矩形通道，但随着压力下降的增加，传热的这种增强具有相称。基于这些结果，本文以普遍的设计建议结束了，考虑到早期采用超临界二氧化碳进行热管理应用。

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