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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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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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Dimensional analysis simplifies complex physical problems and guides experimental investigations, but it does not provide complete solutions. It identifies the dimensionless groups that influence a phenomenon, but experimental data is needed to establish the specific relationships and validate theoretical predictions.
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Updated: Oct 27, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Dynamic heterogeneity and viscosity decoupling: origin and analytical prediction.

Nilimesh Das1, Pratik Sen1

  • 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208 016, UP, India. psen@iitk.ac.in.

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|July 21, 2021
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Understanding solvent heterogeneity is key to functionality. This study reveals how microdomain formation modifies the Stokes-Einstein relationship, explaining viscosity decoupling in complex solvent systems.

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Area of Science:

  • Physical Chemistry
  • Chemical Physics
  • Materials Science

Background:

  • Solvent functionality is dictated by molecular structure and dynamics.
  • Solvent heterogeneity presents an intriguing challenge in understanding these properties.
  • Existing models often struggle to capture the complex dynamics observed in heterogeneous solvents.

Purpose of the Study:

  • To analytically predict the impact of heterogeneity on solvent dynamics.
  • To elucidate the relationship between microdomain formation and viscosity decoupling.
  • To provide a simplified physical model for understanding solvent heterogeneity.

Main Methods:

  • Analytical prediction of modified Stokes-Einstein relationship.
  • Estimation of viscosity decoupling parameter (p) for various solvents.
  • Validation against existing literature values.

Main Results:

  • The Stokes-Einstein relationship is modified in heterogeneous solvents due to microdomain formation.
  • A new term accounting for viscosity decoupling was identified.
  • Estimated p values for selected solvents showed good agreement with literature data.

Conclusions:

  • The proposed model offers a simple yet insightful physical picture of solvent heterogeneity.
  • Microdomain formation is a critical factor in viscosity decoupling.
  • This work advances the understanding of structure-dynamics relationships in complex media.