一滴水在与含有固体颗粒的液体薄膜碰撞时的扩散动力学
Jiale Wang1, Lei Li2, Xinlong Lu1
1International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China. dwjing@mail.xjtu.edu.cn.
Physical chemistry chemical physics : PCCP
|May 20, 2024
概括
这项研究表明,将二氧化 (TiO2) 纳米粒子添加到水滴中,可以减少它们的最大传播直径. 增加的纳米粒子度增加了滴滴收缩和反弹期间的振荡.
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
- 表面科学是一门学科.
背景情况:
- 在各种工业过程中,了解滴滴膜相互作用至关重要.
- 纳米颗粒对液滴动态的影响,特别是传播,仍然是积极研究的领域.
研究的目的:
- 为了研究二氧化 (TiO2) 纳米颗粒对脱离离子水滴冲击液体膜的传播动态的影响.
- 确定纳米粒子度如何影响滴滴的传播,收缩和反弹特征.
- 开发一个滴滴最大传播直径的预测模型,结合纳米粒子效应.
主要方法:
- 在低冲击速度下对去离子化水滴与TiO2纳米粒子载荷液体薄膜发生碰撞的实验观测.
- 分析滴滴传播速度,动态接触角度,无维传播直径和最大无维反弹高度.
- 开发和验证一个用于预测最大扩散直径的新模型.
主要成果:
- 增加TiO2纳米粒子度同样影响滴滴传播速度和动态接触角度.
- 滴滴无维度扩散直径在收缩过程中表现出更明显的振荡,纳米粒子度更高.
- 考虑固体粒子的开发模型显示,与现有模型相比,与实验数据有更好的一致性.
- 固体-液体相互作用 (斯托克斯力) 在最大扩散时对表面能量贡献不到2%,这表明直接效应可以忽略不计.
结论:
- 纳米颗粒显著影响滴滴传播动态,主要是通过增加粘性消散.
- 开发的模型准确地预测了纳米粒子载入滴滴中减少的最大扩散直径.
- 这些发现为控制纳米粒子悬浮的应用中滴滴行为提供了宝贵的见解.
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