基板灵活性对柔性超水表面非牛顿式滴滴冲击动态的影响
Manglesh Singh1, Saikat Basu2, Devranjan Samanta1
1Department of Mechanical Engineering, IIT Ropar, Rupnagar, Punjab, 140001, India.
Journal of colloid and interface science
|November 9, 2025
概括
灵活的基板改变掉落反弹的动态,硬度在抑制非牛顿式掉落冲击中起着关键作用. 较低的刚度促进反弹,即使在会导致沉积在刚性表面的条件下.
科学领域:
- 流体动力学 流体动力学
- 材料科学 材料科学 材料科学
- 类风病学 类风病学 类风病学
背景情况:
- 非牛顿滴通常通过聚合物吸附和粘度增加等机制抑制刚性超表面 (SHS) 上的反弹.
- 当动态压力超过毛细管压力 (PD/PC > 1) 并且森伯格数大于1 (Wi > 1) 时,对刚性表面的落冲击会导致沉积.
- 灵活的基板在落下冲击和基板振荡之间引入了合动态,这表明刚性是抑制反弹的新因素.
研究的目的:
- 为了研究基板刚度对影响弹性表面的非牛顿式下降反弹动态的影响.
- 为了确定流体弹性,冲击惯性和基板刚度如何相互作用,以控制落下冲击结果.
主要方法:
- 落撞击实验是使用水性聚烯胺溶液在悬臂梁上进行的.
- 流体弹性因变化的聚合物度而变化.
- 冲击惯性通过调整掉落释放高度 (韦伯数,We) 来控制.
- 通过使用不同的材料,系统地改变了基板的刚性.
主要成果:
- 基板刚度是卡西到温泽尔过渡 (CWT) 在柔性表面上的关键参数,与刚性不同.
- 降低基板刚度 (增加灵活性) 促进掉落反弹,即使满足沉积条件 (PD/PC > 1,Wi > 1).
- 基于聚合物度,韦伯数和基质刚度,观察和绘制了不同的冲击结果.
结论:
- 流体弹性,冲击惯性和基板度之间的相互作用决定了灵活表面上的非牛顿式落差冲击行为.
- 基板灵活性提供了一种新的机制来控制反弹抑制,与刚性表面动力学不同.
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