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具有层次的微/纳米结构的金属表面对和池沸热传递特征的腐蚀作用
Wei Xu1, Longchang Tang2, Ningkang Zhao1
1College of Smart Energy, Shanghai Jiao Tong University, Shanghai, 200240, China.
Heliyon
|April 29, 2024
概括
腐蚀对用于沸传热的工程表面产生重大影响. 虽然一些微结构最初会增强临界热流 (CHF),但长时间暴露在腐蚀性环境中会降低性能,影响设备的效率和安全.
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
- 表面工程是什么?表面工程是什么?
背景情况:
- 表面修改对于提高沸热传递效率和临界热量流 (CHF) 是至关重要的.
- 腐蚀性环境对热传输结构表面的长期性能的影响在很大程度上是未知的.
- 了解这些影响对于在恶劣条件下运行的设备的可靠性和安全性至关重要.
研究的目的:
- 研究用于沸传热的微结构金属表面 (不钢和Inconel) 的腐蚀作用.
- 分析不同的微观结构,尺寸和腐蚀条件如何影响传热性能,特别是CHF.
- 阐明性能退化背后的机制,并确定适用于腐蚀性环境的最佳表面设计.
主要方法:
- 微结构表面 (微,微腔,微柱阵列) 的制造,其特征尺寸为~20和50μm.
- 样品暴露在腐蚀性环境中,pH值为7.0-8.5,持续时间长达300天.
- 综合评估池沸热传递特征,包括CHF,并分析泡动态.
主要成果:
- 并非所有微观结构都能持续增强池热传递,尤其是CHF.
- 一个不钢微槽样本最初在50天内显示CHF增加 (60.94到94.09W·cm−2),但在300天后显著下降 (至47.77W·cm−2).
- 性能变化与增强等级结构的形成和由于腐蚀而增加接触角的有害影响之间的平衡有关.
结论:
- 腐蚀可以显著改变工程表面的沸热传递性能.
- 在腐蚀性条件下的表面微观结构演变决定了热传递的净效应,随着时间的推移,性能可能会降低.
- 这些发现为设计耐用表面和了解它们在恶劣的沸环境中的行为提供了指导.
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