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Updated: Jan 28, 2026

06:07
Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
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在大振幅振荡式延伸流下体杆动力学
Steffen M Recktenwald1, Vincenzo Calabrese1,2, Amy Q Shen1
1Micro/Bio/Nanofluidics Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan. simon.haward@oist.jp.
Soft matter
|January 26, 2026
概括
我们研究了纤维素纳米晶 (CNC) 棒如何在变化的流动中对齐. 非线性反应发生在高流速和快速变化的情况下,影响了诸如薄膜造等工业过程的预测.
科学领域:
- 合体和聚合物科学 聚合物科学
- 流体动力学 流体动力学
- 材料科学 材料科学 材料科学
背景情况:
- 了解体棒动力学对于材料加工至关重要.
- 短暂的流量显著影响粒子的方向.
- 纤维素纳米晶体 (CNC) 是模拟棒状的合体.
研究的目的:
- 为了研究时间依赖平面延伸流下的合棒的方向动力学.
- 将实验结果与单分散和多分散系统的理论模型进行比较.
- 为优化涉及棒状合物的工业流程提供见解.
主要方法:
- 使用微流体装置将受控的,时间依赖的延伸流应用于CNC悬挂.
- 采用定量流量诱导的双断率来测量CNC定向动态.
- 执行了单分散和多分散系统的模拟,匹配旋转扩散系数.
主要成果:
- 由于粒子对齐,在更高的Péclet数 (Pe0) 上观察到非线性双折响应.
- 在较高的Deborah数 (De) 中鉴定了不对称的反应和残留效应,这是由于棒的响应时间有限.
- 在实验和多分散模拟之间实现了半定量一致,特别是对于较长的CNC棒.
结论:
- 这项研究阐明了模块化流量中的合棒的复杂定向行为.
- 这些发现突显了Péclet和Deborah数在决定体动态学中的重要性.
- 结果有助于预测和优化棒状材料在纤维线和薄膜造等短暂加工流程中的行为.
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