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Related Concept Videos

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.
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...
Determination of Molar Masses of Polymers II01:27

Determination of Molar Masses of Polymers II

Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...
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...
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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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

Hydrodynamic and viscoelastic effects in polymer diffusion.

J Farago1, H Meyer, J Baschnagel

  • 1Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, 22 rue du Loess, BP 84047, F-67034 Strasbourg, France. jean.farago@ics-cnrs.unistra.fr

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 29, 2012
PubMed
Summary
This summary is machine-generated.

We present a new fluctuating hydrodynamics method to analyze polymer dynamics. This approach captures complex hydrodynamic and viscoelastic interactions, improving upon existing models for polymer motion in solution and melts.

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Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
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Area of Science:

  • Polymer Physics
  • Computational Chemistry
  • Soft Matter Physics

Background:

  • Existing models like Zimm and Rouse have limitations in describing complex polymer dynamics.
  • Hydrodynamic and viscoelastic interactions significantly influence polymer behavior.

Purpose of the Study:

  • To develop a fluctuating hydrodynamics approach for studying polymer dynamics.
  • To investigate the impact of hydrodynamic and viscoelastic interactions on polymer motion and Rouse mode relaxation.

Main Methods:

  • Utilizing a fluctuating hydrodynamics approach.
  • Analyzing polymer dynamics in both dilute solutions (Θ solvent) and unentangled melts.

Main Results:

  • The developed method successfully describes hydrodynamic interactions beyond the scope of Zimm and Rouse models.
  • The approach accurately reproduces the effects of viscoelastic hydrodynamic interactions on center-of-mass diffusion in polymer melts.

Conclusions:

  • Fluctuating hydrodynamics offers a more comprehensive framework for polymer dynamics.
  • This method advances the understanding of polymer behavior in various environments, particularly in melts.