PULSATIONS AND GROWTH OF GAS-FILLED BUBBLES IN SOUND FIELDS

PULSATIONS AND GROWTH OF GAS-FILLED BUBBLES IN SOUND FIELDS

The pulsations of a gas-filled bubble in a sound field are discussed with particular attention to the effect of the viscosity of the external liquid, the irreversible conduction of heat by the gas within the bubble, and the scattering of energy by the bubble. The expressions for the gas pressure wit...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: Rosenberg, Murray D
Format: Report
Sprache:eng
Schlagworte:
ABSTRACTS
ACOUSTIC FIELDS
BUBBLES
CAVITATION
CONDUCTIVITY
CONTRACTORS
DIFFUSION
EXTERNAL
FILLING
Fluid Mechanics
GAS FLOW
GASES
GROWTH(GENERAL)
IRREVERSIBLE PROCESSES
LIQUIDS
MEAN
PRESSURE
RADIUS(MEASURE)
RATES
SCATTERING
SURFACES
TIME
TRANSIENTS
VISCOSITY
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Beschreibung
Zusammenfassung:The pulsations of a gas-filled bubble in a sound field are discussed with particular attention to the effect of the viscosity of the external liquid, the irreversible conduction of heat by the gas within the bubble, and the scattering of energy by the bubble. The expressions for the gas pressure within the bubble and the time rate of change of bubble radius are used to determine the rate at which gas diffuses in and out of a bubble of mean radius. A threshold for bubble growth, called the threshold for gaseous-type cavitation, is defined by the condition that the net flow of gas across the surface of the bubble will be zero. This average rate of gaseous diffusion can also be used to determine in a stepwise fashion the mean change of bubble radius with time. Transient effects are also discussed.