Related Experiment Video
Updated: May 30, 2026
14:22
Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
Published on: April 11, 2014
Acoustic cavitation mechanism: a nonlinear model
Christian Vanhille1, Cleofé Campos-Pozuelo
1Universidad Rey Juan Carlos, Tulipán s/n, 28933 Móstoles, Madrid, Spain. christian.vanhille@urjc.es
Ultrasonics Sonochemistry
|August 2, 2011
Summary
This study models acoustic cavitation, showing bubbles form at high ultrasonic amplitudes. These cavitation bubbles significantly alter the ultrasonic field through dissipation and dispersion.
Area of Science:
- Acoustics
- Fluid Dynamics
- Nonlinear Physics
Background:
- Acoustic cavitation involves bubble formation in liquids under specific acoustic pressure conditions.
- The interaction between the ultrasonic field and generated bubbles is a complex phenomenon.
- Understanding bubble dynamics is crucial for applications involving acoustic cavitation.
Purpose of the Study:
- To develop and present a model for analyzing acoustic cavitation in one-dimensional standing waves.
- To investigate the relationship between nonlinear ultrasonic fields and bubble generation.
- To quantify the effects of cavitation bubbles on ultrasonic wave propagation.
Main Methods:
- Development of a nonlinear code named SNOW-BL for simulation.
- Modeling the cavitation phenomenon within one-dimensional standing ultrasonic waves.
- Identifying bubble nucleation sites based on rarefaction pressure peaks exceeding a cavitation threshold.
Main Results:
- Cavitation bubbles are observed to nucleate at high acoustic amplitudes.
- The presence of cavitation bubbles significantly impacts the ultrasonic field.
- Observed effects include increased dissipation, dispersion, and nonlinearity in the ultrasonic wave.
Conclusions:
- The study successfully models the association between nonlinear ultrasonic fields and acoustic cavitation bubble generation.
- The findings highlight the substantial influence of cavitation bubbles on ultrasonic wave characteristics.
- This work provides a foundational model for further research into acoustic cavitation dynamics.
Related Concept Videos
01:28Standing Waves in a Cavity
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
01:20Types of Damping
If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
01:07Damped Oscillations
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
01:21Design Example: Creating a Hydraulic Model of a Dam Spillway
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
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...
01:30Typical Model Studies
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.