Related Experiment Video
Updated: May 29, 2026
08:19
Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
Effects of fluid viscosity on a moving sonoluminescing bubble
Rasoul Sadighi-Bonabi1, Mona Mirheydari, Nastaran Rezaee
1Department of Physics, Sharif University of Technology, 11365-91 Tehran, Iran. sadighi@sharif.ir
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 21, 2011
Summary
Increasing fluid viscosity in single bubble sonoluminescence affects bubble path and light intensity. Higher viscosity leads to brighter emissions but decreased intensity over time.
Area of Science:
- Acoustics
- Fluid Dynamics
- Physical Chemistry
Background:
- Sonoluminescence involves light emission from collapsing bubbles.
- Understanding bubble dynamics in different fluids is crucial for applications.
- Previous models often simplified hydrodynamic forces.
Purpose of the Study:
- To investigate the effect of fluid viscosity on moving single bubble sonoluminescence (m-SBSL).
- To analyze bubble trajectory and light emission parameters under varying viscosities.
- To explore the relationship between viscosity, bubble dynamics, and luminescence intensity.
Main Methods:
- Utilized a quasi-adiabatic model for bubble interior parameters.
- Employed a complete form of hydrodynamic force to calculate bubble trajectory.
- Applied the Bremsstrahlung model to describe bubble radiation.
Main Results:
- Bubble trajectory shifted from circular to ellipsoidal and linear with increasing viscosity.
- Light intensity increased with incrementally higher fluid viscosity.
- Higher viscosity fluids exhibited decreasing light intensity over time.
Conclusions:
- Fluid viscosity significantly alters m-SBSL bubble dynamics and light output.
- Viscosity is a key parameter influencing sonoluminescence intensity and bubble path.
- The Bremsstrahlung model effectively correlates viscosity with emission brightness.
More Related Videos
Related Concept Videos
01:17Viscosity
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...
The SI unit of viscosity is...
01:27Viscosity
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...
01:19Viscosity 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.
01:20Stokes' Law
Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only for low Reynolds...
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only for low Reynolds...
02:57Surface 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...
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...
01:09Deriving the Speed of Sound in a Liquid
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave propagating...
The speed of sound in fluids can be derived by considering a mechanical wave propagating...