毛细管诱导的粘合剂接触动力学决定了湿水凝包装中的消散和流动结构
Zohreh Farmani1,2, Jing Wang3, Ralf Stannarius3
1van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands. j.a.dijksman@uva.nl.
Soft matter
|June 17, 2025
概括
潮湿的水凝颗粒由于毛细血管应力而表现出独特的流动行为. 这些压力受到湿度的影响,主导颗粒物质流,导致更窄的剪切带和显著的流量消散.
科学领域:
- 软物质物理学 软物质物理学
- 颗粒物质科学 颗粒物质科学
- 类风病学 类风病学 类风病学
背景情况:
- 颗粒状材料的散量反应取决于粒子特性,如摩擦,柔软性和粘附性.
- 潮湿的水凝颗粒是软的,由于毛细血管桥梁的弱粘性,提供了一个简化的系统来研究颗粒流.
研究的目的:
- 为了研究毛细血管应力在湿水凝颗粒的宏观流动中的作用.
- 探索微观相互作用与宏观流动行为之间的关系.
主要方法:
- 微型实验将相对湿度 (RH) 与液体桥梁大小和破裂距离相关联.
- 宏观规模的实验使用一个分裂的底部剪切细胞观察散装流.
- 磁共振成像 (MRI) 用于检索流场.
- 测量流电阻的风力计技术.
主要成果:
- 观察到RH和液桥大小之间的直接相关性,湿度增加导致平均破裂距离更大.
- 潮湿的水凝包装呈现出狭窄的剪切带,比干燥的颗粒状流量要窄得多.
- 流动阻力由毛细血管桥梁应力主导,独立于填充高度,并受到外部压力的影响.
结论:
- 毛细管应力是控制湿水凝颗粒包装的宏观流动行为的关键因素.
- 微尺度的毛细管相互作用直接影响宏观的流量消散和剪切带的形成.
- 了解这些微尺度属性对于预测和控制颗粒物质流动至关重要.
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