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Related Concept Videos

Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
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Steady, Laminar Flow Between Parallel Plates01:17

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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.
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Couette Flow01:22

Couette Flow

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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...
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The Hall Effect01:30

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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:
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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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Anti-Poiseuille flow by spin Hall effect.

Junji Fujimoto1, Wataru Koshibae2, Sadamichi Maekawa2,3,4

  • 1Department of Electrical Engineering, Electronics, and Applied Physics, Saitama University, Saitama 338-8570, Japan.

PNAS Nexus
|December 16, 2024
PubMed
Summary

Researchers discovered a new type of viscous electron fluid in spin Hall systems, leading to an anti-Poiseuille flow. This finding opens new avenues for spintronics and manipulating magnetic textures.

Keywords:
charge and spin transportsmagnetic skyrmionspin Hall effectviscous electron fluid

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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Quantum Hydrodynamics

Background:

  • Electron hydrodynamics describes fluid-like electron flow when electron-electron interactions dominate.
  • Ohmic flow is a standard model, but viscous electron fluids exhibit unique properties like Poiseuille flow.
  • Spin Hall effect couples charge and spin currents, offering new possibilities for electron dynamics.

Purpose of the Study:

  • To investigate the emergence of viscous electron fluid in spin Hall systems.
  • To explore the characteristics of this unique fluid, including its flow profile.
  • To connect spin accumulation with electric current vorticity and propose methods for manipulating magnetic textures.

Main Methods:

  • Solving hydrodynamic equations for a 2D spin Hall system with a cavity.
  • Employing micromagnetic simulations for attached chiral magnetic insulators.
  • Analyzing the relationship between spin accumulation and electric current vorticity.

Main Results:

  • Demonstrated a novel viscous electron fluid in noninteracting electron systems exhibiting the spin Hall effect.
  • Observed an anti-Poiseuille flow, characterized by minimum current density at the center and maximum at the edges.
  • Established a link between spin accumulation and electric current vorticity in 2D spin Hall systems.

Conclusions:

  • The study reveals unique hydrodynamic behavior in spin Hall systems, distinct from traditional Poiseuille flow.
  • Spin accumulation near boundaries can be harnessed to create magnetic skyrmions, offering a new method for magnetic texture manipulation.
  • This research bridges electron hydrodynamics and spintronics, providing insights for future device applications.