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Effect of ultrasound on bubble breakup within the mixing chamber of an effervescent atomizer
, K. Ramamurthi
Published in
2011
Volume: 50
   
Issue: 3
Pages: 305 - 315
Abstract
Gas bubbles introduced into a liquid in the mixing chamber help to break up the liquid into fine droplets on being expanded to the ambient pressure. The passage of gas bubbles through the orifice of the nozzle requires that the size of the bubbles be much smaller than the diameter of the orifice. In the present work, the effectiveness of 20. kHz ultrasound to increase number density of fine bubbles within the mixing chamber of an effervescent atomizer by breaking up bubbles introduced in it by an aerator was investigated. Bubbles of initial size in the range of 5-10. mm were shown to get disintegrated into clusters of micron and sub-micron sized bubbles. A fine spray was produced in the presence of ultrasound at a gas-to-liquid mass flowrate ratio (GLR) of 0.063%. The half-cone angle of spray was in the range of 6-10°, which compares favorably with conventional atomizers. The experimental findings of bubble breakup were theoretically modeled by the Rayleigh-Plesset equation. The results of the model indicate that bubbles having initial radius less than 3. mm undergo growth and subsequent disintegration at 20. kHz for the given acoustic pressure of 0.3. MPa. © 2011 Elsevier B.V.
About the journal
JournalChemical Engineering and Processing: Process Intensification
ISSN02552701
Open AccessNo
Concepts (20)
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    ACOUSTIC PRESSURES
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    Ambient pressures
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    BREAK-UP
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    BUBBLE BREAK-UP
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    Cone angle
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    EFFERVESCENT ATOMIZATION
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    EFFERVESCENT ATOMIZERS
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    Gas bubble
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    Mass flow rate
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    MIXING CHAMBER
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    Number density
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    RAYLEIGH-PLESSET EQUATION
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    Spray
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    Submicron
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    Ultrasound
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    Atomization
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    Bubbles (in fluids)
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    Liquids
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    Orifices
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    Ultrasonics