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Related Concept Videos

Viscosity01:27

Viscosity

113
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...
113
Viscosity01:17

Viscosity

7.9K
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...
7.9K
Thermodynamic Properties of Ideal Solutions01:19

Thermodynamic Properties of Ideal Solutions

74
For an ideal liquid solution, the standard state of each component is defined as the pure liquid at the temperature and pressure of the solution. Similarly, for solid solutions, the standard state is the pure solid. The chemical potentials of the components in the ideal solution are compared to the chemical potentials of the pure substances in their standard states. These standard states provide a reference point for calculating the thermodynamic properties of ideal solutions.For ideal...
74
Viscosity of Fluid01:19

Viscosity of Fluid

2.2K
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.
2.2K
Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

1.1K
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...
1.1K
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

34.5K
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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Related Experiment Video

Updated: Mar 28, 2026

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Isomorphic Viscosity Equation of State for Binary Fluid Mixtures.

Hassan Behnejad, Hashem Cheshmpak, Asma Jamali

    Acta Chimica Slovenica
    |December 19, 2015
    PubMed
    Summary

    This study developed a viscosity model for binary hydrocarbon mixtures using the isomorphism principle and equations of state. The model accurately predicts viscosity, offering a reliable method for hydrocarbon mixture analysis.

    Area of Science:

    • Thermodynamics
    • Fluid Mechanics
    • Physical Chemistry

    Background:

    • The thermodynamic behavior of binary mixtures near critical lines exhibits universal characteristics.
    • The isomorphism hypothesis allows mapping mixture properties from pure components.

    Purpose of the Study:

    • To develop a viscosity model for binary mixtures based on the isomorphism principle.
    • To predict the viscosity of hydrocarbon mixtures using cubic equations of state.

    Main Methods:

    • Applied the isomorphism principle to link P-ρ-T and T-η-P relationships.
    • Utilized Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) equations of state.
    • Validated the model with methane-butane mixture viscosity data.

    Main Results:

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    • The developed viscosity model showed reasonable agreement with experimental data.
    • Accurate viscosity predictions were achieved for the methane-butane mixture.
    • The model is effective for hydrocarbon mixtures up to 35 MPa.

    Conclusions:

    • The isomorphism principle combined with viscosity equations of state provides a reliable model.
    • This approach offers a robust method for calculating hydrocarbon mixture viscosity.
    • The model is suitable for a wide pressure range within experimental errors.