在1000°C以上抑制Leidenfrost效应,用于持续的热冷却
Mengnan Jiang1,2, Yang Wang1,2,3, Fayu Liu1
1Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China.
Nature
|January 27, 2022
概括
研究人员开发了一种新型的热,可以防止高达1150°C的Leidenfrost效应,从而显著改善超高温应用的热传递.
科学领域:
- 材料科学
- 热力学
- 热传输
背景情况:
- 莱登弗罗斯特效应描述了液滴在热面上的悬浮,这会损害高温下的热传递.
- 现有的增强Leidenfrost点的方法,如表面纹理和通道布局,通常会损害热冷却效率.
- 让莱登弗罗斯特点和热冷却同时实现最大化是一个重大挑战.
研究的目的:
- 设计和演示结构化的热, 克服莱登弗罗斯特效应的局限性.
- 在显著更高的温度下抑制Leidenfrost效应,同时保持高效的热传递.
- 为超高温固体表面提供有效的水冷解决方案.
主要方法:
- 采用钢柱作为热桥的工程结构的热.
- 集成一个隔热膜用于液体吸收和散布.
- 嵌入U形通道以有效疏散蒸汽.
- 利用材料的对比热和几何性质来创建非均的温度分布.
主要成果:
- 已经成功抑制了莱登结效应,温度高达1150°C,比之前的记录高出600°C.
- 在广泛的温度范围内保持和增强热传输能力.
- 材料和几何之间的合作效应已被证明,导致横向吸气和改善冷却.
- 设计的限制在于材料的点, 而不是热的故障.
结论:
- 结构化热提供了强大的解决方案,以应对极端温度下的莱登效应.
- 通过将均温度转化为不均的温度,并促进液体吸附,该设计可实现高效的热冷却.
- 这一战略为在超出以前可实现的温度限制的表面实施有效的水冷却铺平了道路.
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