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Cavitation effect of ultrasound
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Process Technology
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Release time:
2025-12-23
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The cavitation effect of ultrasound is a unique physical phenomenon triggered when ultrasonic waves propagate through a medium. At its core, it involves the generation, growth, and collapse of tiny bubbles (cavitation bubbles) within the medium.
I. Definition and Process
The ultrasonic cavitation effect refers to the dynamic process in which microbubbles—cavitation bubbles existing within a wave medium—vibrate under the action of sound waves. When the acoustic pressure reaches a certain threshold, these bubbles undergo a growth and collapse cycle. Specifically, as ultrasonic waves propagate through a liquid, the liquid particles alternately experience states of compression and rarefaction under the influence of the sound waves. In the rarefied state, the particles are subjected to tensile forces; when the tensile force exceeds the static pressure, vacuum cavities—i.e., bubbles—begin to form. These bubbles continue to vibrate and grow as the sound waves persist, and when the acoustic pressure reaches a specific threshold, they rapidly collapse and close, releasing an enormous amount of energy in the process.
II. Phenomena and Characteristics
1. Bubble Formation and Collapse: Under the action of ultrasound, a large number of tiny bubbles are generated in the liquid. These bubbles continuously grow under the vibration of sound waves and eventually collapse. When the bubbles collapse, they produce localized high temperatures and pressures, as well as intense shock waves and microjets. These effects exert a powerful influence on substances within the liquid.
2. High Temperature and High Pressure: The localized high temperature and high pressure generated during bubble collapse can reach several thousand kelvins and several hundred megapascals. These extreme physical conditions help accelerate chemical reactions and physical transformations. 3. Shock Waves and Microjets: The shock waves and microjets released during bubble collapse possess tremendous impact forces, capable of breaking down insoluble contaminants, rapidly crushing them, and dispersing them evenly throughout the cleaning medium.
III. Applications and Impacts
The cavitation effect of ultrasound has wide-ranging applications in multiple fields, particularly in the field of cleaning. The high temperature and pressure, shock waves, and microjets generated by the cavitation effect can effectively remove contaminants from the surfaces of workpieces. Moreover, the ultrasonic cavitation effect can also promote chemical reactions, break down suspended particles within liquids, produce emulsions, and kill bacteria.
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