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相关概念视频

Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Magnetic Flux01:18

Magnetic Flux

The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

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相关实验视频

Updated: May 21, 2026

Quantifying Mixing using Magnetic Resonance Imaging
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在使用磁场的微流系统中增强混合 - - 实验和数值分析.

Marek Wojnicki1, Xuegeng Yang2, Piotr Zabinski1

  • 1Faculty of Non-Ferrous Metals, AGH University of Science and Technology, Mickiewicza Ave. 30, 30-059 Krakow, Poland.

Micromachines
|April 26, 2025
PubMed
概括

磁场可以通过影响流体流动和创建,显著增强微流体系统中的混合. 这种方法为传统的扩散限制微反应器提供了一种无机械,具有成本效益的替代方案.

关键词:
活跃的混合 活跃的混合增强了混合的混合.磁场的混合 磁场的混合磁场驱动的混合是磁场驱动的混合.微流系统是微流系统.通过被动混合混合.

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科学领域:

  • 微流体学 微流体学
  • 磁动力学 磁动力学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 微流体系统往往面临着缓慢的混合速度的挑战,这是由于层状流中的扩散限制.
  • 在微反应器中增强混合的传统方法可能是复杂的或涉及机械部件.
  • 利用物质的物理性质,如磁性易感性,为改进混合提供了潜在的途径.

研究的目的:

  • 为了研究使用外部磁场在微流系统中增强混合.
  • 通过数值和实验验证磁场对流体动力学和混合的影响.
  • 探索一种新的,无机械的方法,以提高微流体设备的混合效率.

主要方法:

  • 使用COMSOL多物理进行了数值模拟.
  • 实验验证是使用粒子图像速度计 (PIV) 进行的.
  • 使用永久性磁铁的微流体设置来影响含Ho (III) 离子丰富的层状水流.

主要成果:

  • (III) 离子和磁场之间的相互作用显著改变了流动模式.
  • 在高磁场强度区域的下游观察到流的流失.
  • 数字模拟显示与实验PIV数据有很好的一致性,证实了磁场的影响.

结论:

  • 在微流系统中,使用无机械元件的磁场可以实现显著的混合增强.
  • 物质之间的磁性特性差异可以有效地利用来驱动混合.
  • 这种方法提供了一种实用,具有成本效益和安全的方法,用于增加微流体应用中的混合强度.