对近壁卵石床热导电性的分析,用于能源应用
Katelyn Wada1, Josh Eixenberger1,2,3, Dallin Stout4
1Micron School of Materials Science and Engineering, Boise State University, Boise, Idaho 83725, United States.
ACS omega
|January 15, 2024
概括
烧结石石床的导热率在墙壁附近明显高于散装. 这种差异归因于热接触电阻,影响了热储存系统的设计.
科学领域:
- 材料科学 材料科学 材料科学
- 热力工程是热力工程中的一个.
- 储能 储能 储能 储能 储能 储能
背景情况:
- 卵石床对于高温热储和能源系统中的热交换至关重要.
- 准确了解热传导对于材料选择,系统设计和安全监测至关重要.
- 在石床中,导热率可以在几何边界附近呈现显著的变化.
研究的目的:
- 为了研究烧结石石床的导热率变化,特别是在靠近墙壁的区域.
- 为了确定几何边界对卵石床的整体传热特性的影响.
- 阐明了导致热导率在边界附近变化的潜在机制.
主要方法:
- 利用复杂的多层分析模型与线源探头相结合,测量热导率.
- 采用微型计算机断层扫描 (微型CT) 来分析卵石床的多孔性.
- 墙壁附近地区和卵石床的大部分部分的孔隙度测量进行了比较.
主要成果:
- 观察到墙壁附近地区的热导率大幅增加 (7.6 W m-1 K-1) 与大部分 (0.59 W m-1 K-1) 相比.
- 微CT分析显示,近壁 (33.18%) 和散装 (33.31%) 区域之间的多孔性差异很小.
- 这项研究表明,热接触电阻是改变墙壁附近的导热率的主要因素.
结论:
- 烧焦石卵石床的导热性在靠近墙壁的区域显著增强.
- 热接触电阻在改变几何边界的传热行为中起着至关重要的作用.
- 这些发现对于优化使用石床的热储系统的设计和性能至关重要.
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