Related Experiment Video
Updated: Mar 24, 2026
08:19
Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
2.8K
Interfacial wave dynamics of a drop with an embedded bubble.
1Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409, USA.
Physical Review. E
|March 18, 2016
Summary
Detecting internal fluid voids is possible by analyzing surface waves of a liquid drop. An embedded bubble significantly alters wave frequencies and modes, offering insights for diagnostics and material characterization.
Area of Science:
- Fluid dynamics
- Acoustics
- Non-destructive testing
Background:
- Surface waves on liquid drops are sensitive to internal structures.
- Detecting internal voids in opaque fluids is challenging.
- Acoustic excitation can induce measurable vibrations in liquid drops.
Purpose of the Study:
- To investigate the effect of an embedded bubble on the surface wave dynamics of a suspended liquid drop.
- To establish a theoretical framework for predicting these changes.
- To demonstrate the potential for void detection using surface wave analysis.
Main Methods:
- Utilizing a matrix formalism to model the natural oscillation frequencies.
- Analyzing acoustically induced forced vibrations and deformations.
- Comparing theoretical predictions with potential experimental data.
Main Results:
- An embedded bubble causes significant shifts in natural oscillation frequencies and amplitudes.
- The presence of a cavity leads to a twofold increase in the number of natural modes.
- Theoretical predictions highlight distinct changes in surface wave behavior due to internal voids.
Conclusions:
- Surface wave analysis of liquid drops can serve as a non-destructive method for detecting internal voids.
- The observed changes in oscillation modes and frequencies offer a diagnostic signature for internal defects.
- The findings have implications for process diagnostics, material characterization, and combustion technology.
Related Concept Videos
01:13Excess Pressure Inside a Drop and a Bubble
3.8K
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
3.8K
01:09Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
898
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
898
01:22Surface Tension of Fluid
1.9K
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
1.9K
01:07Reflection of Waves
4.8K
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
4.8K
02:18Interference and Diffraction
53.9K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
53.9K
01:07Propagation of Waves
3.2K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
3.2K