基于太阳盐的纳米流体的特定热容量:分子动力学模拟和实验
Fahim Mahtab Abir1, Donghyun Shin1
1School of Engineering and Technology, Central Michigan University, Mt Pleasant, MI 48859, USA.
Materials (Basel, Switzerland)
|January 26, 2024
概括
这项研究使用SiO2纳米粒子增强了化太阳盐 (MSS) 的特异热容量 (SHC),在实验中观察到15.65%的增加. 分子动力学模拟证实了这种增强,将其归因于纳米结构的形成和表面积的增加.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 化学工程是化学工程的重要组成部分.
背景情况:
- 化太阳盐 (MSS) 对于集中太阳能 (CSP) 热能储存至关重要.
- 提高MSS的特定热容量 (SHC) 对于提高储能效率至关重要.
- 之前的研究表明,纳米粒子添加可以增加MSS SHC,但理论验证缺乏.
研究的目的:
- 用SiO2纳米粒子实验性地确定MSS的SHC.
- 通过分子动力学 (MD) 模拟,理论上研究SHC增强背后的机制.
- 验证实验发现,并探索纳米结构在SHC增加中的作用.
主要方法:
- 差分扫描热量计 (DSC) 用于测量MSS纳米流体的SHC,其中含有1.0%SiO2纳米粒子.
- 分子动力学 (MD) 模拟在纯MSS和与SiO2纳米粒子和NaNO3纳米结构混合物上进行.
- 模拟分析了纳米结构形成,表面积和表面能量对SHC的影响.
主要成果:
- 实验分析显示,使用1.0%SiO2纳米粒子,MSS的SHC平均增加15.65%.
- 模拟MD显示最大的SHC增加25.03%与13.71%的NaNO3纳米结构.
- 纳米结构的形成,增加的表面积和表面能量对SHC产生了积极的影响,尽管基盐SHC略有下降.
结论:
- 添加SiO2纳米粒子显著提高化太阳盐的SHC.
- MD模拟为观察到的实验增强提供了理论基础,突出了纳米结构的作用.
- 优化MSS纳米流体中的纳米结构含量和特性可以导致更高效的热能储能系统.
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