d'Agostino, Luca and Brennen, Christopher E. (1988) Acoustical Absorption and Scattering Cross-Sections of Spherical Bubble Clouds. In: Cavitation and Multiphase Flow Forum - 1988 : presented at the National Fluid Dynamics Congress sponsored by AIAA/ASME/ASCE/SIAM/APS, Cincinnati, Ohio, July 24-28, 1988. Fluids Engineering Division, FED-64 (64). American Society of Mechanical Engineers , New York, 50-53b. http://resolver.caltech.edu/CaltechAUTHORS:DAGasmecmff88
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The present work investigates the acoustical absorption and scattering cross-sections of spherical bubble clouds subject to harmonic far field pressure excitation. Bubble dynamics effects and energy dissipation due to viscosity, heat transfer, liquid compressibility and relative motion of the two phases are included. The equations of motion for the average flow and for the bubble radius are linearized and a closed form solution is obtained. Due to the presence of natural oscillatory modes and frequencies, the acoustical cross-sections of the cloud are very different from those of each individual bubble in the cloud, as well as from the acoustical cross-sections of a single large bubble with the same volume of vapor and gas. In general the acoustical properties of any given volume of the dispersed phase depend strongly on the degree of dispersion because of the complex interactions of the dynamics of the bubbles with the whole flow.
|Item Type:||Book Section|
|Additional Information:||The authors would like to thank Cecilia Lin for her help in drawing the pictures. This work was supported by the Naval Sea System Command General Hydromechanics Research Program Administered by the David Taylor Naval Ship Research and Development Center under Contract No. N00167-85-K-0165, by the Office of Naval Research under contract No. N0014-83-K-0506 and by a Fellowship for Technological Research administered by the North Atlantic Treaty Organization - Consiglio Nazionale delle Ricerche, Italy, Competition No. 215.15/11 of 11.5.1982. Their support is gratefully acknowledged.|
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|Deposited By:||Christopher Brennen|
|Deposited On:||10 Dec 2004|
|Last Modified:||26 Dec 2012 08:39|
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