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相关概念视频

Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

4.8K
Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
4.8K
Divergence and Curl of Magnetic Field01:26

Divergence and Curl of Magnetic Field

4.1K
The magnetic field due to a volume current distribution given by the Biot–Savart Law can be expressed as follows:
4.1K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.7K
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...
1.7K
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

6.7K
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.
6.7K
Magnetic Flux01:18

Magnetic Flux

5.2K
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...
5.2K
Couette Flow01:22

Couette Flow

1.2K
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
1.2K

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相关实验视频

Updated: Mar 15, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
11:00

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

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在无碰撞磁再连接过程中,流量交叉和并行输出.

Theerasarn Pianpanit1, Kittipat Malakit2, Pakkapawn Prapan3

  • 1Kasetsart University, Department of Applied Radiation and Isotopes, Faculty of Science, Bangkok, Thailand.

Physical review letters
|March 13, 2026
PubMed
概括

在磁再连接期间的等离子流交叉显示离子和电子移动不同,产生并行流出. 这一发现对于理解太空等离子体运输和能量至关重要.

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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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相关实验视频

Last Updated: Mar 15, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
11:00

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Published on: July 19, 2016

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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

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Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods
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科学领域:

  • 空间物理 空间物理
  • 等离子体物理学的物理学
  • 计算天体物理学 计算天体物理学

背景情况:

  • 无碰撞的磁再连接是空间等离子体的一个基本过程,驱动着极光和太阳耀斑等现象.
  • 了解等离子体流动力学对于重新连接期间的能量转移和粒子加速至关重要.

研究的目的:

  • 为了研究在2D无碰撞磁再连接过程中详细的等离子体流动模式.
  • 识别和描述"流交叉"现象及其对平行散体运动的影响.

主要方法:

  • 使用了2D粒子在细胞模拟.
  • 采用标记粒子来根据它们的初始流入区域标记离子和电子.

主要成果:

  • 观察到一个"流体交叉",其中流入的等离子体流穿过中间平面,然后形成流出喷气.
  • 确定了离子和电子的独特并行驱动机制,导致不同的流交叉模式.
  • 发现由于这些机制,重新连接的输出流主要是并行的,特别是对于电子.

结论:

  • 流交叉和并行外流是无碰撞磁再连接的一般特征,发生在对称和不对称的情况下.
  • 预测局部逆转的等离子体属性梯度在不对称的重新连接站点,可通过实地测量观察.
  • 结果对量化磁断层传输和理解能量分区,包括粒子加热具有重要意义.