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Related Concept Videos

Standing Waves01:17

Standing Waves

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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Shock Waves01:16

Shock Waves

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
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Travelling Waves01:04

Travelling Waves

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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
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Sound Waves01:01

Sound Waves

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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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:
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Wave Parameters01:10

Wave Parameters

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The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
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Related Experiment Video

Updated: Mar 22, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Surface waves on a soft viscoelastic layer produced by an oscillating microbubble.

Marc Tinguely1, Matthew G Hennessy, Angelo Pommella

  • 1Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK. v.garbin@imperial.ac.uk.

Soft Matter
|April 14, 2016
PubMed
Summary
This summary is machine-generated.

Ultrasound bubbles deform viscoelastic gels, generating surface waves. Unexpectedly, wave rotation reverses with distance, depending on gel properties, revealing insights into bubble-surface interactions.

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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
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Area of Science:

  • Physics
  • Materials Science
  • Acoustics

Background:

  • Ultrasound-driven bubbles induce significant deformation in soft viscoelastic materials.
  • The influence of viscoelastic boundary properties on bubble-boundary interactions is poorly understood.
  • Existing research lacks quantitative analysis of these dynamic interactions.

Purpose of the Study:

  • To investigate the dynamic deformation of a viscoelastic layer caused by ultrasound-driven microbubble oscillations.
  • To explore the relationship between microbubble dynamics and the viscoelastic properties of the boundary.
  • To elucidate the underlying mechanisms of bubble-induced surface wave generation and propagation.

Main Methods:

  • Utilizing high-speed video microscopy to observe microbubble oscillations (17-20 kHz) in contact with a hydrogel surface.
  • Analyzing the generated surface elastic (Rayleigh) waves and particle trajectories.
  • Developing a 3D model for viscoelastic solid deformation by localized oscillating forces.

Main Results:

  • Observed localized oscillating pressure from microbubbles generating Rayleigh waves on the hydrogel.
  • Characterized elliptical particle trajectories with varying tilt angles relative to bubble distance.
  • Discovered an unexpected shift in surface element rotation direction (prograde to retrograde) dependent on viscoelastic properties.

Conclusions:

  • The study provides a quantitative understanding of ultrasound bubble-viscoelastic layer interactions.
  • A 3D model successfully replicated experimental observations, validating the findings.
  • Results offer insights applicable to surface cleaning and biomedical applications involving ultrasound and soft materials.