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Sreedhar, B. K.
- Computation of Erosion Potential of Cavitation Bubble in an Ultrasonic Pressure Field
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Authors
Affiliations
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam-603102, IN
2 Materials Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam-603102, IN
3 Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, IN
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam-603102, IN
2 Materials Technology Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam-603102, IN
3 Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 39, No 2 (2017), Pagination: 60-69Abstract
Cavitation is the creation and collapse of a vapor cavity in a liquid. Cavitation can be produced by a sound field and this principle is employed in the ultrasonic vibratory cavitation device. The rapidly fluctuating applied pressure results in cavitation of the liquid. The pressure produced by the collapse of a vapor bubble can be determined by solving equations of bubble dynamics. The fundamental equation of bubble dynamics is the Rayleigh-Plesset- Noltingk-Neppiras-Poritsky equation popularly known as the RP equation. This equation does not account for the effect of liquid compressibility. Gilmore's equation, which considers liquid compressibility, can be used to obtain realistic estimates of bubble wall velocities at the end of bubble collapse. This paper discusses the numerical solution of Gilmore's equation to evaluate the bubble wall velocity at the end of bubble collapse and the pressure imposed on a solid surface from impingement of the resulting jet. The parameters affecting the growth and collapse of a single bubble is are studied. A discussion of results of cavitation damage experiments in sodium is also provided as a confirmation of the theoretical estimate of damage.Keywords
Ultrasonic Cavitation, Gilmore's Equation, Collapse Pressure.Full Text
References
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- Design and Analysis of Ultrasonic Horn for Cavitation Generation in Liquid Sodium
Abstract Views :181 |
PDF Views:0
Authors
Affiliations
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam-603102, IN
2 Materials Technology Division, Metallurgy and Materials Group, HBNI, Kalpakkam-603102, IN
3 Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, IN
1 Fast Reactor Technology Group, Indira Gandhi Centre for Atomic Research, HBNI, Kalpakkam-603102, IN
2 Materials Technology Division, Metallurgy and Materials Group, HBNI, Kalpakkam-603102, IN
3 Department of Chemical Engineering, Institute of Chemical Technology, Mumbai-400019, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 39, No 4 (2017), Pagination: 127-131Abstract
A vibratory cavitation device is commonly used in the laboratory to study cavitation erosion damage of materials in liquids. These devices are designed and operated in conformance with ASTM-G32 code. The main component of this device is the horn which is used to generate cavitation in the test liquid. The horn operates at ultrasonic frequency and is powered by a piezoelectric crystal driven by an ultrasonic generator. This paper discusses the analysis and design of an ultrasonic horn operating at 20 kHz with peak to peak displacement amplitude of 50 microns at the free end. The free end of the horn is immersed in liquid sodium. The material selection and design of the horn is carried out for a maximum temperature of 550°C. The horn is also provided with features to facilitate sealing of the vessel containing the test liquid (sodium) while ensuring that the necessary amplitude is obtained at the free end without unduly stressing the horn. The analysis is carried out using FEM software and the results are compared with the measured values.Keywords
Cavitation, Vibratory Device, Ultrasonic Horn.Full Text
References
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