纳米流体对加热表面的影响
Xiaotian Ma1, Ahmed Aldhaleai1, Lihui Liu1,2
1Mechanical Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
Langmuir : the ACS journal of surfaces and colloids
|February 5, 2024
概括
将SiO2纳米粒子添加到乙烯糖醇 (EG) 滴中,改变了它们在加热表面上的冲击行为. 纳米粒子影响滴滴的传播,原子化和Leidenfrost温度,其影响因度和可湿性而异.
科学领域:
- 流体动力学 流体动力学
- 纳米材料科学科学 纳米材料科学
- 热传递是一种热传递.
背景情况:
- 了解滴滴对加热表面的影响对于各种工业应用至关重要.
- 在不同的热条件下纳米流体的行为尚未完全理解.
- 乙烯糖醇 (EG) 是一种常见的工作液体,其与纳米粒子添加剂的行为需要进行调查.
研究的目的:
- 在加热的表面上实验性地研究含有水友性和疏水性SiO2纳米粒子 (NP) 的乙烯基醇 (EG) 滴的冲击动力学.
- 在非沸,沸和Leidenfrost制度中建立影响结果的阶段图.
- 为了确定NP度和湿度对滴滴传播,原子化和Leidenfrost温度的影响.
主要方法:
- 实验中使用EG滴滴含有SiO2NP,其度从0.89%到64.3%进行了实验.
- 表面温度控制在100至400°C之间,滴滴撞击速度恒定为0.22 ± 0.02 m/s.
- 创建了相位图来绘制基于NP度和表面温度的冲击结果.
主要成果:
- 在非沸状态下,NP添加不会影响散布率低于11.9%的重量;较高度会增加粘度,影响散布.
- 在沸状态下,低NP度 (0.89重量%) 促进了原子化,不论可湿性如何.
- 莱登冰层温度 (TL) 随着NP度的增加而增加,对疏水性NP度的增加更为显著.
结论:
- 纳米粒子显著改变了加热表面上的滴滴撞击动态,其影响取决于度和可湿性.
- 该研究提供了关于NP度和湿度如何影响布传播,影响结果和Leidenfrost温度的定量见解.
- 这些发现在涂料,喷涂和冷却技术中具有潜在的应用.
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