通过选择性激光炼制造的复合孔状结构的沸热传递特征研究
Houli Liu1, Zhonghao Gu1, Jun Liang2
1School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China.
Materials (Basel, Switzerland)
|October 14, 2023
概括
复合性多孔结构增强沸时的热传递. 表面微孔在低热量流量下提高传热系数,而框架微孔在高热量流量下提高性能.
科学领域:
- 材料科学 材料科学 材料科学
- 热传递工程 热传递工程
- 增材制造 增材制造 增材制造
背景情况:
- 表面的多孔性对于改善沸热传递至关重要.
- 复合性多孔结构为热传递增强提供了一个有希望的途径.
研究的目的:
- 为了研究不同复合材料多孔结构对沸热传递性能的影响.
- 探索孔腔形态和表面粗度在热传递增强中的作用.
主要方法:
- 使用AlSi10Mg粉末选择性激光化 (SLM) 制造复合性多孔结构.
- 池沸实验,以评估传热系数和临界热量流.
- 包括粗度测量在内的表面表征.
主要成果:
- 具有表面和框架微孔的复合孔状结构显著提高了传热系数.
- 表面微孔增加了传热面积和核化位点密度,在低热量流量下提高了性能.
- 框架微孔结构在高热量流量时促进了气液转移,从而提高了性能.
- 较粗的表面表现出比喷砂样品高出40%的传热系数.
- 复合结构中的通道大小被确定为关键热量流量的关键因素.
结论:
- 选择性激光化可以创建先进的复合材料多孔结构,以增强沸热传递.
- 优化孔隙结构和表面形态是最大限度地提高不同热流模式的传热效率的关键.
- 这些发现为设计各种热管理应用的高效传热表面提供了宝贵的见解.
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