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Related Concept Videos

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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

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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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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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Newtonian Fluid: Problem Solving01:18

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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.
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Types of Fluids01:27

Types of Fluids

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Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
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Stokes' Law01:20

Stokes' Law

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Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
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Multiple Effects of the Second Fluid on Suspension Viscosity.

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Adding a second fluid to particle suspensions significantly alters viscosity and yield stress. Microstructure changes explain this non-monotonic rheological behavior, revealing distinct dispersive, cluster, and cell states.

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Area of Science:

  • Rheology
  • Colloid Science
  • Materials Science

Background:

  • Particulate suspensions are ubiquitous in industrial applications.
  • The addition of a second immiscible fluid can significantly impact suspension rheology.

Purpose of the Study:

  • To investigate the rheological properties of particle suspensions with small additions of a second immiscible fluid.
  • To correlate microstructural changes with observed rheological behavior.

Main Methods:

  • Systematic variation of the second fluid dosage in a particulate suspension.
  • Rheological measurements of viscosity and yield stress.
  • Microstructural analysis using confocal laser scanning microscopy (CLSM).

Main Results:

  • A non-monotonic trend in viscosity and yield stress was observed with increasing second fluid dosage.
  • Three distinct microstructural states were identified: dispersive, cluster, and cell states.
  • The observed microstructural transitions correlate with the non-monotonic rheological response.

Conclusions:

  • The addition of small amounts of a second immiscible fluid induces complex rheological behavior in particle suspensions.
  • Microstructural evolution, specifically the formation of clusters and cells, governs the non-monotonic viscosity and yield stress.
  • Understanding these structure-property relationships is crucial for controlling suspension behavior.