Accession Number : ADA115837

Title :   Bubble Dynamics and Resulting Noise from Traveling Bubble Cavitation.

Descriptive Note : Technical memo.,


Personal Author(s) : Marboe,R C

PDF Url : ADA115837

Report Date : 13 Apr 1982

Pagination or Media Count : 126

Abstract : The acoustic noise spectrum associated with traveling bubble cavitation on a Schiebe headform in a variable pressure water tunnel was measured over the 2.5 to 80 kHz frequency range. Bubble dynamics were observed through video taping and the nuclei distribution was obtained holographically. Observed noise spectra showed that low frequency noise can be modeled by incompressible theory. High frequency noise, apparently resulting from a shock wave, can be modeled by compressible theory. The spectrum was seen to shift toward lower frequencies than predicted possibly due to axisymmetric bubble collapse. The spectral energy per bubble was experimentally derived and was found to be a reasonable approximation to that predicted by incompressible theory over the cavitation number range tested. The collapse peak pressure amplitude distribution, the maximum bubble radius distribution and the nuclei distribution were all found to be lognormal. (Author)

Descriptors :   *Bubbles, *Cavitation noise, Dynamics, Shock waves, Underwater acoustics, Incompressibility, Sound pressure, Spectral energy distribution, Traveling waves, Theses

Subject Categories : Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE