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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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Viscosity01:17

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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.
The SI unit of viscosity is...
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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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Surface Tension, Capillary Action, and Viscosity02:57

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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

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Development of an In Vitro Ocular Platform to Test Contact Lenses
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Development of ocular viscosity characterization method.

Shu-Hao Lu, Guo-Zhen Chen, Stanley Y Y Leung

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |March 9, 2017
    PubMed
    Summary

    A new indentation method measures ocular viscosity, offering a potential diagnostic tool for glaucoma. This technique correlates blocked eye drainage with increased viscosity, aiding in diagnosing normal tension glaucoma.

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    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Fluid Dynamics

    Background:

    • Glaucoma is a leading cause of irreversible blindness, characterized by optic nerve damage often linked to elevated intraocular pressure (IOP).
    • Current methods primarily measure IOP, but lack ways to assess the viscous response related to blocked ocular fluid drainage.
    • Normal tension glaucoma presents a diagnostic challenge as nerve damage occurs without significantly elevated IOP.

    Purpose of the Study:

    • To develop and validate an indentation method for characterizing ocular flow and viscosity.
    • To establish a correlation between ocular viscosity and blocked fluid drainage in the eye.
    • To explore the potential of ocular viscosity as a novel diagnostic parameter for glaucoma.

    Main Methods:

    • Development of an indentation technique to assess ocular biomechanics.
    • Conducting indentation tests on porcine eyes with controlled drainage.
    • Analysis of load-relaxation data to determine ocular viscosity.

    Main Results:

    • The indentation method successfully characterized ocular flow.
    • Blocked ocular drainage was found to correlate with increased ocular viscosity.
    • The study demonstrated a successful correlation between ocular viscosity and drainage parameters.

    Conclusions:

    • Ocular viscosity, measured via indentation, shows promise as a new diagnostic parameter for glaucoma.
    • This method could be particularly valuable for diagnosing normal tension glaucoma.
    • Ocular viscosity may serve as a complementary diagnostic tool alongside conventional IOP measurements.