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Related Concept Videos

Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
Viscosity01:27

Viscosity

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 faster-moving...
Viscosity01:17

Viscosity

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.
The SI unit of viscosity is...
Viscosity of Fluid01:19

Viscosity of Fluid

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.
Navier–Stokes Equations01:28

Navier–Stokes Equations

For incompressible Newtonian fluids, where density remains constant, stresses show a linear relationship with the deformation rate, defined by normal and shear stresses. Normal stresses depend on the pressure exerted on the fluid and the rate of deformation in specific directions, which determines how fluid flows under varying pressures. Shear stresses, on the other hand, act tangentially across fluid layers. They explain how adjacent fluid layers slide relative to one another, connecting...
Couette Flow01:22

Couette Flow

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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Related Experiment Video

Updated: May 29, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
06:07

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Published on: April 25, 2019

Static and dynamic shear viscosity of a single-layer complex plasma.

Peter Hartmann1, Máté Csaba Sándor, Anikó Kovács

  • 1Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, Budapest, Hungary.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 27, 2011
PubMed
Summary

This study measured the shear viscosity of dusty plasma, observing shear-thinning behavior under static stress and a transition from viscous to elastic properties with increasing frequency under dynamic stress. Molecular dynamics simulations supported these findings.

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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

Published on: January 3, 2014

Area of Science:

  • Plasma Physics
  • Soft Condensed Matter Physics

Background:

  • Dusty plasmas exhibit complex behaviors relevant to astrophysics and industrial applications.
  • Understanding the rheological properties of dusty plasmas is crucial for modeling their dynamics.

Purpose of the Study:

  • To experimentally measure the static and dynamic shear viscosity of a single-layer dusty plasma.
  • To investigate shear-thinning behavior and frequency-dependent viscoelasticity.

Main Methods:

  • Applying stationary and modulated shear stress using laser-induced light pressure.
  • Measuring complex shear viscosity under varying shear rates and frequencies.
  • Conducting molecular dynamics simulations for validation.

Main Results:

  • Observed shear-thinning behavior (viscosity decreases with increasing shear rate) under static conditions.
  • Demonstrated strong frequency dependence in complex viscosity under oscillating shear.
  • Identified a transition from viscous to elastic behavior with increasing excitation frequency.

Conclusions:

  • Experimental results align with molecular dynamics simulations.
  • Dusty plasmas exhibit tunable rheological properties dependent on shear rate and frequency.