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関連する概念動画

Magnetic Field Lines01:19

Magnetic Field Lines

6.5K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
6.5K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.9K
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...
1.9K
Irrotational Flow01:28

Irrotational Flow

1.3K
Irrotational flow is characterized by fluid motion where particles do not rotate around their axes, resulting in zero vorticity. For a flow to be irrotational, the curl of the velocity field must be zero. This imposes specific conditions on velocity gradients. For instance, to maintain zero rotation about the z-axis, the gradient condition:
1.3K
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

1.0K
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
1.0K
Couette Flow01:22

Couette Flow

1.3K
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...
1.3K
General External Flow Characteristics01:26

General External Flow Characteristics

640
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
640

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関連する実験動画

Updated: Apr 12, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 16, 2013

12.2K

地球の中核におけるゾーンフロー形成.

Takehiro Miyagoshi1, Akira Kageyama, Tetsuya Sato

  • 1Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan.

Nature
|February 12, 2010
PubMed
まとめ

研究者らは,放射状の羽根と西向きのゾナルフローを特徴とする,地球の外核における新しいコンベクションパターンを発見した. この二重構造は,強い磁場であっても安定しており,地力学運動の過程についての洞察を提供します.

科学分野:

  • 地質物理学 地質物理学とは地質物理学です.
  • 流体力学 流体力学とは
  • 惑星科学は惑星科学である.

背景:

  • ゾナルジェットは,惑星の大気や地球の海洋のような自然的な乱流系で一般的です.
  • ゾーンフロー形成は,核融合装置でも観察されています.
  • 地球の外側核は乱流していると考えられており,ゾナルの流れの可能性を示唆しています.

研究 の 目的:

  • 地球の液体外核におけるゾナルフローの可能性を調査する.
  • ジオダイナモの内部でこれまで知られていなかったコンベクション・レジムを探求するために.
  • 磁場の下でのそのような流れの安定性を決定するために.

主な方法:

  • 低粘度限界におけるジオダイナモの数値シミュレーション.
  • 液体鉄の外部コアにおけるコンベクションパターンの分析.
  • 強い,自己生成の二極磁場の下での安定性の確認.

主要な成果:

  • 二重構造を持つ新しいコンベクション体制の発見.
  • 内側,シート状の放射状の羽根の識別.
  • 外部,西向きの円筒形のゾーン流の観測.

さらに関連する動画

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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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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Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

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関連する実験動画

Last Updated: Apr 12, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 16, 2013

12.2K
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

12.0K
Magnetically Induced Rotating Rayleigh-Taylor Instability
06:42

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

10.2K

結論:

  • 新たに確認された二重コンベクション構造は,西向きのゾーンフローを含めて安定しています.
  • この発見は,ジオダイナモプロセスと地球の磁場生成に関する新しい理解を提供します.
  • この結果は,ゾナルの流れが,惑星の渦巻く核の中で自発的に発生し,持続することを示唆しています.