Cryogenic quenching enhancement using a groove lattice filled with a low-thermal conductivity sealant
Cryogenic quenching enhancement using a groove lattice filled with a low-thermal conductivity sealant
复制标题
使用填充低导热率密封剂的凹槽晶格增强低温淬火
DOI：
10.1016/j.ijheatmasstransfer.2022.123247
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发表时间：
2022
影响因子：
5.2
通讯作者：
Toma Tsujino
中科院分区：
文献类型：
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作者：
Katsuyoshi Fukiba;Yusaku Kameya;Toma Tsujino
本研究提出并评价了一种提高低温流体中金属板沸腾换热的方法。这种方法是用填充了低导热密封胶的沟槽晶格对表面进行纹理处理。首先，采用电火花加工的方法对铜板表面的槽点阵进行加工。其次，用导热性低的硅酮密封胶填充凹槽。第三，从凹槽突出的密封胶是用刀具刀片去除。这种表面结构使气膜和核同时沸腾，使气膜不稳定。因此，纹理增强了传热，缩短了冷却时间。在本研究中，除了顶部表面有点阵图案外，其余各面都用聚苯乙烯板包裹铜板。这些封闭的铜板浸泡在液氮中。记录了铜板的温度变化，并用于计算热流密度。通过不同条件下的实验，研究了槽距、槽深、铜的面积比等因素的影响。我们成功制备了冷却时间最短的表面，大约是裸铜板的1/5倍。这种表面可以持续重复使用而不会出现故障，并且具有成本效益。
This study proposed and evaluated a method of enhancing the boiling heat transfer of metal plates in cryogenic fluid. This method textures surfaces with a groove lattice filled with a low-thermal-conductivity sealant. First, electric discharge machining was performed to process a groove lattice on the surfaces of a copper plate. Second, the grooves were filled with a silicone sealant with low thermal conductivity. Third, sealant protruding from the grooves was removed using a cutter blade. This surface texture produced simultaneous film and nucleate boiling, making the gas film unstable. Consequently, the texture enhanced the heat transfer and shortened the chilldown time. In this study, polystyrene boards were used to enclose copper plates on all sides except the top surface, which was textured with the lattice pattern. These enclosed copper plates were soaked in liquid nitrogen. The temperature variation of the copper plates was recorded and used to calculate the heat flux. Effects of the pitch, depth of the grooves, and area ratio of copper were investigated through experiments with variable conditions. We successfully prepared a surface with the shortest chilldown time, which is approximately 1/5 times that of a bare copper plate. This surface can sustain repeated use without failure and is cost effective.