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Related Concept Videos

Free Jet01:14

Free Jet

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Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
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General External Flow Characteristics01:26

General External Flow Characteristics

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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...
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Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

903
Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
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Bernoulli's Equation for Flow Along a Streamline01:30

Bernoulli's Equation for Flow Along a Streamline

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Bernoulli's equation relates the energy conservation in a fluid moving along a streamline. The equation applies to incompressible and inviscid fluids under steady flow. For such a flow, Newton's second law is applied to a small fluid element, which experiences forces due to pressure differences, gravity, and velocity variations. The force balance leads to the following form of Bernoulli's equation:
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Laminar and Turbulent Flow01:07

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Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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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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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Thin jets underlie the solar wind.

Ignacio Ugarte-Urra1, Yi-Ming Wang1

  • 1Space Science Division, Naval Research Laboratory, Washington, DC, USA.

Science (New York, N.Y.)
|August 24, 2023
PubMed
Summary
This summary is machine-generated.

Solar Orbiter captured images of magnetic plasma jets originating from the Sun's surface. These jets are fundamental to understanding the solar wind's origin and behavior.

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Area of Science:

  • Solar Physics
  • Plasma Astrophysics
  • Heliophysics

Background:

  • The solar wind is a continuous stream of charged particles released from the upper atmosphere of the Sun.
  • Understanding the origin and acceleration mechanisms of the solar wind is a key challenge in solar physics.

Purpose of the Study:

  • To investigate the small-scale magnetic structures at the solar surface that may be responsible for generating the solar wind.
  • To analyze the morphology and dynamics of plasma jets observed at the roots of the solar wind.

Main Methods:

  • Utilizing high-resolution imaging data from the Solar Orbiter spacecraft.
  • Analyzing the magnetic field configurations and plasma flows in the solar chromosphere and corona.

Main Results:

  • Widespread occurrence of small-scale magnetic plasma jets observed at the solar surface.
  • These jets are found to be prevalent in regions associated with the origin of the solar wind.
  • Evidence suggests these jets play a significant role in the initial acceleration and release of solar wind plasma.

Conclusions:

  • Magnetic plasma jets at the solar surface are a crucial component in the generation of the solar wind.
  • The findings provide new insights into the microphysics driving solar wind acceleration.
  • Further research on these jets will enhance our understanding of space weather and its impact on the solar system.