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Related Concept Videos

Viscosity of Fluid01:19

Viscosity of Fluid

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Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
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Viscosity01:17

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When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
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Viscosity01:27

Viscosity

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Viscosity is a property of fluids that measures their resistance to flow. It is influenced by factors such as the surface area of contact, the gradient of flow speed, and the fluid's viscosity constant, called the coefficient of viscosity. The coefficient of viscosity, also known as dynamic viscosity, is denoted by the symbol η. It determines the proportionality between the viscous force and the gradient of flow speed.Newton's law of viscosity states that the viscous force on a...
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Magnetostatic Boundary Conditions01:28

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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...
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Viscosity jump in Earth's mid-mantle.

Maxwell L Rudolph1, Vedran Lekić2, Carolina Lithgow-Bertelloni3

  • 1Department of Geology, Portland State University, Post Office Box 751, Portland, OR 97207, USA. maxwell.rudolph@pdx.edu.

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Summary

Scientists found a significant increase in deep mantle viscosity between 800-1200 km depth. This discovery helps explain phenomena like stagnant tectonic plates and deflected mantle plumes.

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Area of Science:

  • Geophysics
  • Earth Science
  • Mantle Dynamics

Background:

  • Deep mantle viscosity influences Earth's thermal evolution, plume dynamics, and material mixing.
  • Understanding mantle layering is crucial for comprehending large-scale geological processes.

Purpose of the Study:

  • To infer the viscous layering of Earth's deep mantle without prior assumptions.
  • To investigate the relationship between viscosity variations and observed deep mantle structures.

Main Methods:

  • Reanalysis of long-wavelength nonhydrostatic geoid data.
  • Employing a novel method to determine viscosity variations with depth.

Main Results:

  • Detected a substantial increase in mantle viscosity at depths of 800–1200 km.
  • This viscosity increase occurs below the mantle transition zone.
  • The depth of increased viscosity correlates with seismic observations of slab stagnation and plume deflection.

Conclusions:

  • The inferred viscosity increase provides a unifying explanation for observed deep mantle phenomena.
  • This finding challenges previous assumptions about mantle viscosity layering.
  • Highlights the importance of viscosity structure in deep mantle dynamics.