Heat transfer enhancement of aluminum boiling surface with micro-grooves fabricated by laser
Heat transfer enhancement of aluminum boiling surface with micro-grooves fabricated by laser
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DOI：
10.1016/j.ijft.2022.100274
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发表时间：
2023-02
影响因子：
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通讯作者：
Hironobu Hirahara;F. Motomura;Yufei Liu;C. Kondou
中科院分区：
文献类型：
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作者：
Hironobu Hirahara;F. Motomura;Yufei Liu;C. Kondou
由于电子设备制造的最新进展，需要有效的冷却和散热系统来实现有效的技术性能。在这方面，已经研究了环形热虹吸管，目的是改善其散热性能。其关键技术是通过表面改性来改善沸腾传热。本文研究了所选工质R1234 ze（E）在利用激光干涉表面结构化技术（利斯）制作的微织构沸腾表面上的沸腾特性。与未加工的表面相比，网格槽LISS加工表面表现出显着的沸腾传热系数的增强。观察到基于未处理表面的最大传热系数的240-275%的增强。然而，在较高的热通量下观察到显着的传热退化。此外，为了检查由微槽引起的芯吸对临界热通量的影响，使用无量纲芯吸数对毛细管力进行量化，其中乙醇用于测试沸腾表面。具有许多不规则小空腔的测试表面表现出最高值。这些表面也表现出最高的临界热通量。热虹吸管的临界热流密度随芯吸数的增加而单调增加。
Owing to recent advances in the manufacture of electronic devices, efficient cooling and heat-dissipation systems are required to achieve efficient technological performance. In this regard, looped thermosyphons have been studied with the intent of improving their heat-dissipation performance. The key technique is to improve the boiling heat transfer with a modified surface. This study presents the boiling characteristics of the selected working fluid, R1234ze(E), on a microtextured boiling surface fabricated using Laser Interference Surface Structuring (LISS). Compared with the unfabricated surface, the grid-grooved LISS-fabricated surfaces exhibit significant enhancements in the boiling heat transfer coefficients. An enhancement of 240—275% in the maximum heat transfer coefficient based on the untreated surface was observed. However, a significant heat transfer degradation was observed at higher heat fluxes. Additionally, to examine the effect of wicking induced by microgrooves on the critical heat flux, the capillary force was quantified using a dimensionless wicking number with ethanol utilized for the test boiling surfaces. The test surfaces with numerous irregular small cavities exhibited the highest values. These surfaces also exhibited the highest critical heat flux. The measured critical heat flux in the thermosyphon increased monotonically with an increasing wicking number.