磁聚合体脉冲作为隐形混合器,以制微流体中的标量泰勒分散
Zakaria Larbi1, Faïçal Larachi1, Seyed Mohammad Taghavi1
1Department of Chemical Engineering, Université Laval, Québec, QC G1V 0A6, Canada. faical.larachi@gch.ulaval.ca.
Soft matter
|October 31, 2025
概括
磁场驱动的微流体中的磁纳米粒子 (MNP) 脉冲显著增强了标尺混合. 这种新的方法克服了层状流量的局限性,提高了运输和均化效率.
科学领域:
- 微流体学 微流体学
- 结合体科学 结合体科学
- 磁动力学是一种磁动力学.
背景情况:
- 微流体标尺混合通常受到层流和弱横传输的限制.
- 泰勒-阿里斯分散增强了轴向扩散,但没有有效的交叉流混合.
研究的目的:
- 研究使用磁纳米粒子 (MNP) 脉冲与磁场的磁性纳米粒子 (MNP) 脉冲来积极控制微流体中的标尺分散.
- 增强跨流运输和提高标尺混合效率.
主要方法:
- 在微流体通道中注入磁纳米粒子 (MNP) 脉冲.
- 应用静态和旋转磁场来影响MNP动态.
- 在不同的磁场条件下分析标量分散和方差.
主要成果:
- 静态磁场在脉冲前线上诱导凯尔文体力 (KBF).
- 旋转的磁场会产生自旋流,增强交叉流的运输和混合.
- 带有磁场的高MNP Péclet数 (Pe ≈ 10^4) 会导致度前线振荡和二次流.
- 持续的旋转流减少了MNP变异约85%和标量变异约70%.
结论:
- 磁性驱动的体脉冲为高效的微流体混合提供了一个新的策略.
- 在旋转磁场下控制的MNP脉冲注入产生3D二次结构,以改善均化.
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