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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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Modes of Standing Waves - I01:03

Modes of Standing Waves - I

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Modes of Standing Waves: II01:04

Modes of Standing Waves: II

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
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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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Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
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Review and Preview01:10

Review and Preview

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In statistics, several tools are used to interpret the data. Measures of central tendency represent the characteristics of the data, such as mean, median, and mode. Additionally, measures of variance like standard deviation and range are used to find the spread of data from the mean. Relative standing measures the distance between data locations. Commonly used measures of relative standings are percentile, z score, and quartiles.
Percentiles are a type of fractile that partition data into...
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Updated: Feb 7, 2026

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Phase separation technology based on ultrasonic standing waves: A review.

Xiaoming Luo1, Juhang Cao2, Haiyang Gong2

  • 1College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, PR China; Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, China University of Petroleum, Qingdao 266580, PR China.

Ultrasonics Sonochemistry
|August 7, 2018
PubMed
Summary

This review explores ultrasonic standing wave (USW) phase separation technology, highlighting its petrochemical applications beyond microscale uses. It details separation principles and challenges, offering future research directions for enhanced ultrasonic separation.

Keywords:
Design of reactorPhase separationReviewSeparation principleUltrasonic standing waves

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Area of Science:

  • Chemical Engineering
  • Physical Chemistry
  • Acoustics

Background:

  • Ultrasonic standing waves (USWs) enable advanced phase separation.
  • Previous reviews focused on microscale applications in biology and food.
  • Petrochemical applications of USW technology are underexplored.

Purpose of the Study:

  • To review developments in USW phase separation technology.
  • To focus on USW applications in the petrochemical industry.
  • To detail separation principles, kinetics, reactor design, and challenges.

Main Methods:

  • Review of existing literature on USW phase separation.
  • Detailed discussion of particle motion characteristics in USWs.
  • Categorization of separation principles based on particle and frequency characteristics.

Main Results:

  • USW separation principles include Band effect, Acoustophoretic coefficient, Particle density, and Sweep frequency.
  • Acoustic streaming and acoustic cavitation are identified as key challenges.
  • Diverse principles enhance the versatility of ultrasonic separation technology.

Conclusions:

  • USW technology offers broad applicability in phase separation.
  • Addressing acoustic streaming and cavitation is crucial for future development.
  • Future research should focus on demulsification mechanisms, unified evaluation criteria, and cavitation control.