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Related Concept Videos

Standing Waves01:17

Standing Waves

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...
Standing Waves in a Cavity01:28

Standing 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:
Sound Waves01:01

Sound Waves

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. Hence,...
Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Shock Waves01:16

Shock Waves

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 pressures...

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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Bubbles in an acoustic field: an overview.

Muthupandian Ashokkumar1, Judy Lee, Sandra Kentish

  • 1Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, University of Melbourne, Vic. 3010, Australia. masho@unimelb.edu.au

Ultrasonics Sonochemistry
|January 20, 2007
PubMed
Summary

Acoustic cavitation, driven by sound waves and bubbles, initiates sonochemical reactions. Various techniques reveal complex bubble dynamics like growth and coalescence, crucial for understanding these reactions.

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Area of Science:

  • Physical Chemistry
  • Chemical Engineering
  • Acoustics

Background:

  • Acoustic cavitation is central to sonochemical reactions in liquids.
  • It arises from the interaction of sound waves with bubbles.
  • Bubble dynamics include growth, coalescence, dissolution, and collapse, generating reactive species.

Purpose of the Study:

  • To explore the fundamental processes of acoustic cavitation.
  • To understand the complex bubble dynamics involved.
  • To review experimental techniques for studying cavitation.

Main Methods:

  • Utilized a strobe technique to monitor single bubble growth via rectified diffusion.
  • Employed multibubble sonoluminescence to observe bubble growth and coalescence.
  • Applied a capillary technique to quantify bubble coalescence.

Main Results:

  • Demonstrated that bubbles grow through rectified diffusion and coalesce.
  • Sonoluminescence and capillary techniques provide insights into bubble dynamics.
  • Complex cavitation phenomena result from simple sound-bubble interactions.

Conclusions:

  • Acoustic cavitation is a complex process initiated by sound-bubble interactions.
  • Various experimental methods are essential for dissecting cavitation mechanisms.
  • Understanding bubble dynamics is key to controlling sonochemical reactions.