Accession Number : AD0693445

Title :   COMPUTATIONAL METHOD FOR DETERMINATION OF BUBBLE DISTRIBUTIONS IN LIQUIDS.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER WASHINGTON D C

Personal Author(s) : Brockett,Terry

Report Date : APR 1969

Pagination or Media Count : 70

Abstract : An analytical method of determining the gas bubble spectrum in a liquid from the measured acoustic attentuation is examined. The analysis is based on the linearized equations of motion for a spherical bubble with damping. The bubbles are assumed to be homogeneously distributed in the liquid and the bubble concentration and damping are assumed constant in a small size interval. The acoustic wavelength is assumed much greater than the bubble dimensions and bubbles are assumed far enough apart that no interactions occur. The direct solution gives the acoustic attenuation of a known bubble distribution at any given frequency. An iteration precedure is incorporated in a FORTRAN program for converting acoustic attenuation as a function of frequency to bubble concentration as a function of size. For air bubbles in water, the effects of physical properties on the bubble spectrum are examined with the computer program. Experiments in a 12-inch water tunnel are described. (Author)

Descriptors :   (*CAVITATION, BUBBLES), (*BUBBLES, DISTRIBUTION), LIQUIDS, NUMERICAL ANALYSIS, DETERMINATION, EQUATIONS OF MOTION, DAMPING, ACOUSTIC PROPERTIES, ATTENUATION

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE