相关实验视频
Updated: Jul 5, 2025
06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
9.6K
雷利-泰勒不稳定性在磁动力学中,在水平磁场中具有有限电阻,具有有限电阻
1State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.
Physical review. E
|January 20, 2024
概括
有限电阻显著影响高能量密度等离子体,挑战以前的理论. 这项研究重新探讨了磁铁-雷利-泰勒不稳定性,揭示了磁场扩散和阿特伍德数如何影响等离子体行为.
科学领域:
- 等离子体物理学的物理学
- 磁动力学 磁动力学
- 流体动力学 流体动力学
背景情况:
- 以前的理论,包括 Jukes 的 (1963),低估了有限电阻在高能量密度等离子体中的作用.
- 磁铁-雷利-泰勒不稳定性对于理解磁场下的等离子体行为至关重要.
研究的目的:
- 重新检查朱克斯关于磁铁 - 雷利 - 泰勒不稳定性的理论,以有限电阻 (η) 的磁动力学.
- 为了证明 Jukes 方法的局限性,由于错误的边界条件.
- 呈现一个新的分散关系,准确地捕捉物理.
主要方法:
- 重新审视Jukes的理论,重点关注磁铁-雷利-泰勒不稳定性.
- 对具有有限电阻 (η) 的磁动力学进行数学分析.
- 导出和分析一个新的分散关系.
主要成果:
- 朱克斯的理论被证明是不充分的,因为一个错误的边界条件,未能捕捉到关键的物理特征.
- 新的分散关系表明,较高的增长率导致磁场的快速扩散,减少其稳定作用.
- 阿特伍德数显著改变了增长率曲线的形状,与理想的磁动力学和粘性/弹性流量分离.
- 长波长的增长与η^{1/3}成比例,当磁场完全扩散时,增长率表现为经典.
结论:
- 有限电阻在高能量密度等离子体中起着关键作用,需要修订理论框架.
- 拟议的分散关系提供了一个更准确的描述磁铁-雷利-泰勒不稳定性在电阻等离子体.
- 了解磁场扩散,阿特伍德数和电阻之间的相互作用对于准确预测等离子体行为至关重要.
相关概念视频
01:28Magnetostatic Boundary Conditions
934
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...
934
01:26Divergence and Curl of Magnetic Field
3.0K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
3.0K
01:16Magnetic Field Of A Current Loop
4.6K
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.
4.6K
01:13Torque On A Current Loop In A Magnetic Field
4.0K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
4.0K
01:24Potential Due to a Magnetized Object
287
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...
287
01:17Differential Form of Maxwell's Equations
471
James Clerk Maxwell (1831–1879) was one of the significant contributors to physics in the nineteenth century. He is probably best known for having combined existing knowledge of the laws of electricity and the laws of magnetism with his insights to form a complete overarching electromagnetic theory, represented by Maxwell's equations. The four basic laws of electricity and magnetism were discovered experimentally through the work of physicists such as Oersted, Coulomb, Gauss, and...
471