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Viscosity

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...

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 faster-moving...

Viscosity of Fluid

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.

Surface Tension, Capillary Action, and Viscosity

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...

Poiseuille's Law and Reynolds Number

Poiseuille's Law and Reynolds Number

Any fluid in a horizontal tube can flow due to pressure differences—fluid flows from high to low pressure. The flow rate (Q) is the ratio of pressure difference and resistance through a horizontal tube. The greater the pressure difference, the higher the flow rate. The flow resistance is expressed as:

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.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and their...

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Related Experiment Video

Updated: Jun 25, 2026

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

Ripplon on high viscosity liquid.

Yasuo Minami¹, Keiji Sakai

¹Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan. yminami@iis.u-tokyo.ac.jp

The Review of Scientific Instruments

|February 5, 2009

Summary

This study shows that optical beating ripplon spectroscopy can measure the viscosity of liquids. Higher viscosity liquids exhibit narrower spectral peaks for damped ripplons, allowing for precise measurements up to 1000 cS.

Area of Science:

Physics
Physical Chemistry
Materials Science

Background:

Ripplons are thermally excited capillary waves on liquid surfaces.
Their propagation reveals surface mechanical properties like surface tension and viscoelasticity.
Optical beating ripplon spectroscopy is effective for low-viscosity liquids (1 kHz - 10 MHz).

Purpose of the Study:

To observe highly damped ripplons on viscous liquid surfaces.
To adapt optical beating ripplon spectroscopy for higher viscosity measurements.
To correlate spectral peak width with liquid viscosity.

Main Methods:

Light scattering observation of ripplons.
Application of optical beating ripplon spectroscopy.
Utilizing a dynamic structure factor model for spectral analysis.

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Main Results:

Observed highly damped ripplons on viscous liquid surfaces.
Found that spectral peak width decreases with increasing viscosity.
Successfully fitted experimental data to viscosity up to 1000 cS using the dynamic structure factor.

Conclusions:

Optical beating ripplon spectroscopy is suitable for measuring high viscosity liquids.
The technique can resolve spectral structures related to viscosity.
The dynamic structure factor model accurately describes overdamped ripplons in viscous media.