环路热管烧结毛细芯的抽吸特性

发布时间：2018-11-24 17:00

【摘要】：为提高环路热管毛细芯的抽吸特性,以球形铜粉为原料,Na_2CO_3为造孔剂烧结制备了不同规格的毛细芯,通过红外成像记录工质爬升过程的方法,研究了造孔剂添加比例和铜粉颗粒直径对毛细芯抽吸特性的影响。结果表明铜粉颗粒直径d对毛细芯的抽吸特性具有显著影响,当不添加造孔剂时,工质在毛细芯中的爬升高度和速度随着d的增大而增大。当添加一定比例(b)的造孔剂后,毛细芯的抽吸特性发生明显改变。在爬升过程初始阶段,工质的爬升高度与速度随着b的增加而增加;随着爬升过程的进行,工质在b适中的毛细芯中的爬升高度逐渐成为最大值。同时,发现随着d的增加,最大爬升高度所对应的造孔剂添加比例不断下降,存在颗粒直径与造孔剂添加比例的最佳匹配关系,并相应地推导出了爬升高度、颗粒直径、造孔剂添加比例之间的实验关联式。
[Abstract]:In order to improve the suction characteristics of capillary core of loop heat pipe, the capillary cores of different specifications were sintered with spherical copper powder as raw material and Na_2CO_3 as pore-making agent. The climbing process of working fluid was recorded by infrared imaging. The effects of the proportion of pore-making agent and the diameter of copper powder on the suction characteristics of capillary core were studied. The results show that the diameter of copper particles d has a significant effect on the suction characteristics of the capillary core, and the climbing height and velocity of the working fluid in the capillary core increase with the increase of d without the addition of pore-making agent. When a certain proportion of (b) pore-making agent was added, the suction characteristics of the capillary core changed obviously. In the initial stage of the climbing process, the climbing height and velocity of the working fluid increase with the increase of b, and the climbing height of the working fluid in the b moderate capillary core gradually becomes the maximum value with the increase of the climbing process. At the same time, it is found that the proportion of pore-forming agent corresponding to the maximum climbing height decreases with the increase of d, and the optimum matching relation between particle diameter and the proportion of pore-forming agent is found, and the climbing height and particle diameter are deduced accordingly. The experimental correlation between the proportion of pore-making agent.
【作者单位】：华北电力大学低品位能源多相流与传热北京市重点实验室电站设备状态监测与控制教育部重点实验室;
【基金】：国家自然科学基金(51276061);国家自然科学基金重点项目(51436004) 中核核反应堆热工水力技术重点实验室开放基金资助
【分类号】：TK172.4

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