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Megasonics
General Information
- Megasonics uses high-frequency acoustic waves to generate pressure waves in a fluid. The process is sometimes called acoustic streaming.
- Megasonics may use any of the following chemistries:
- The difference between ultrasonic cleaning and megasonic cleaning is in the frequency used to generate the acoustic waves. Megasonics uses 700- to 1000-kHz frequencies and ultrasonics use 20- to 40-kHz waves.
- The higher megasonic frequencies do not cause the cavitation effects found with ultrasonics. This significantly reduces or eliminates cavitation erosion.
- Parts that cannot be cleaned with ultrasonics because they are sensitive to the frequency or cavitation effects can often be cleaned with megasonics.
- Megasonics is much more dependent on line of sight for cleaning than is ultrasonics. In megasonic cleaning, only the side of the part that is facing the transducer(s) will be cleaned.
- Megasonics is used primarily for particle removal. It may also be used to increase the efficiency of chemical cleaning with surfactants or detergents.
- Megasonics has been used to remove particles smaller than 0.3 µm.
- Exposure time and megasonic power are the most significant variables affecting megasonic cleaning.
- As megasonic power or exposure time increases, particle redeposition decreases.
- Typical exposure times are 10 to 30 minutes.
- Cleaning efficiency improves with increasing temperature.
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All SAGE material, Copyright© 1992,
Research Triangle Institute
Last Update:
15 March 1995
sage@rti.org
http://clean.rti.org/alt.cfm?id=me&cat=gi
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