低雷诺数流动中磁性颗粒输运与操控的研究进展

Research progress on the transport and manipulation of magnetic particles in low Reynolds number flows

  • 摘要: 磁场驱动微纳颗粒的输运在微纳机器人、柔性制造和精准医疗等领域有着重要的应用。近年来相关研究已在实验、数值模拟与理论建模等方面取得了大量进展,但对界面效应、多颗粒集群运动、运动模态调控及多场耦合操控等方面缺乏系统性认识。本文从实验流体力学的视角出发,围绕磁性颗粒在低雷诺数流动环境中的受力与动力学行为,对近年来相关研究进行系统综述。梳理了磁力与磁力矩输入对应的平动、旋转与滚动3类典型运动模式;概述了梯度场与旋转场作用下的受力模型、速度标度关系以及壁面阻滞与润滑效应造成的修正规律;归纳了多颗粒体系中,磁场与水动力耦合及界面几何约束引发的磁性颗粒的集体动力学行为,反映了磁场输入与流体介质之间的非平衡反馈特征;阐述了复合颗粒系统中,磁性颗粒与液滴和囊泡之间的牵引传递机制,呈现了磁驱动下复合体运动的界面动力学基础;进一步总结了磁声、磁电及磁化学等多场耦合体系的代表性机制与应用场景,展示了跨场驱动在复杂介质或特定任务约束下提升操控自由度的潜力。综述旨在为磁驱颗粒输运的力学理解与系统设计提供参考,为磁驱动微系统在生物医学等领域的进一步发展提供基础支撑。

     

    Abstract: The transport of micro- and nano- particles driven by magnetic fields has significant applications in fields such as microrobotics, flexible manufacturing, and precision medicine. In recent years, substantial progress has been made in experimental research, numerical simulations, and theoretical modeling. However, a systematic understanding of interface effects, multi-particle collective motion, motion mode regulation, and multi-field collaborative control remains lacking. This paper provides a systematic review of recent studies from the perspective of experimental fluid mechanics, focusing on the forces and dynamic behaviors of magnetic particles in low Reynolds number fluids. The review organizes three typical motion modes—translation, rotation, and near-wall rolling—corresponding to magnetic force and torque inputs. It outlines force models, velocity scaling relationships, and correction laws due to wall drag and lubrication effects under gradient and rotating fields. It also summarizes the collective dynamics of magnetic particles induced by magnetic field-fluid coupling and interface geometric constraints in multi-particle systems, reflecting the non-equilibrium feedback between magnetic field input and fluid medium. The review discusses the traction transfer mechanisms between magnetic particles and droplets or vesicles in composite particle systems, presenting the interfacial dynamics of composite motion under magnetic driving. Furthermore, it summarizes the representative mechanisms and application scenarios of multi-field collaborative systems, such as magneto-acoustic, magneto-electric, and magneto-chemical systems, demonstrating the potential of cross-field driving to enhance control freedom under complex media or specific task constraints. This review aims to provide a reference for the mechanical understanding and system design of magnetic particle transport, offering foundational support for the further development of magnetic-driven microsystems in biomedical fields.

     

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