在平面收缩微通道中改变收缩比的聚合物溶液流转和缩放规律
Mahmud Raihan1,2, Matthew Markovetz1, David Hill1
1Lampe Joint Department of Biomedical Engineering, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Soft matter
|September 5, 2025
概括
微通道的流动不稳定性受到通道几何学的影响. 聚合物溶液对收缩宽度的变化表现出独特的反应,影响混合和材料回收应用.
科学领域:
- 流体动力学
- 病理学
- 微流体学
背景情况:
- 在地质工程,微流体学和材料加工中,通过收缩和扩张的孔径流非常重要.
- 聚合物溶液由于非线性流体特性而表现出流动不稳定性,即使在爬行流中也是如此.
- 流体几何显著影响剪切和延伸动力学之间的相互作用.
研究的目的:
- 在平面收缩微通道中研究变化的收缩宽度和收缩比 (CR) 的流量反应.
- 检查水和三种不同的聚合物溶液的行为:桑坦,聚乙烯氧化物 (PEO) 和聚烯胺.
- 分析CR对流动不稳定性和动力学的影响.
主要方法:
- 在平面收缩微通道中对孔尺度流量的实验研究.
- 收缩宽度的系统变化以改变收缩比 (CR).
- 使用水和三种不同气质性质的聚合物溶液进行测试 (剪切稀释,粘弹性).
主要成果:
- 大多数流体的收缩和膨胀流通常会随着CR的增加而变得不稳定.
- 聚乙烯氧化物 (PEO) 溶液的不稳定性开始和长度对CR具有非单调的依赖性.
- 其他流体表现出长度对CR的固定顺序依赖,由流体体质学决定.
结论:
- 道几何,特别是收缩宽度和CR,在孔尺度流动稳定性中起着关键作用.
- PEO解决方案的独特非单调反应突显了粘性弹性和几何之间的复杂相互作用.
- 这些发现对于设计微流体设备和优化混合,材料回收和封存等过程具有价值.
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