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Related Concept Videos

Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

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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...
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Viscosity of Fluid01:19

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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

Viscosity

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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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Navier–Stokes Equations01:28

Navier–Stokes Equations

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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...
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Characteristics of Fluids01:20

Characteristics of Fluids

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When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
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Viscoelastic flows in simple liquids generated by vibrating nanostructures.

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Researchers observed non-Newtonian fluid behavior in simple liquids due to high-frequency nanoparticle vibrations. This study reveals bulk continuum effects, offering new insights into fluid mechanics and nanoscale sensing.

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Area of Science:

  • Fluid Mechanics
  • Nanotechnology
  • Physical Chemistry

Background:

  • Traditional fluid mechanics (Newtonian) assumes shear stress is proportional to strain rate, applicable to simple liquids like water.
  • Understanding fluid behavior at extremely high frequencies and nanoscale is crucial for advanced technologies and biophysics.

Purpose of the Study:

  • To measure and theoretically verify non-Newtonian, viscoelastic flow phenomena in simple liquids.
  • To investigate the origin of viscoelasticity at high frequencies, distinguishing it from molecular confinement effects.

Main Methods:

  • High-frequency (20 GHz) vibration of gold nanoparticles immersed in water-glycerol mixtures.
  • Direct mechanical measurement of fluid properties.
  • Theoretical verification of observed phenomena.

Main Results:

  • Observed non-Newtonian, viscoelastic flow phenomena in bulk simple liquids.
  • Demonstrated that viscoelasticity arises from a bulk continuum effect due to short vibration timescales, not molecular confinement.
  • Provided the first direct mechanical measurement of intrinsic viscoelastic properties of simple bulk liquids at high frequencies.

Conclusions:

  • High-frequency nanoparticle vibrations induce measurable viscoelasticity in simple liquids.
  • This phenomenon represents a bulk continuum effect, expanding the understanding of fluid mechanics at extreme frequencies.
  • Opens new avenues for nanoscale sensing technologies and biophysical process research.