Shape Oscillations of Bubbles in Water and Influences Pertinent to Such Oscillations.
Final rept. 1 Jan 91-30 Jun 96,
WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS
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The shape oscillations of acoustically levitated bubbles were used to probe the interfacial rheology of bubbles in clean water and in sea water and in water containing surfactants. Clean water conditions produced agreement with an improved theoretical analysis while bubbles in sea water displayed an excess damping. A new method was demonstrated for injecting a known amount of insoluble surfactant onto an acoustically levitated bubble. The method was used to test an analysis of the increase in damping and the shifi oscillation in frequency resulting from the modification of the interfacial rheology. Analysis of CCD images of pendant bubbles was used to monitor the evolution of the surface tension resulting from surfactants injected onto a pendant bubble.
- Fluid Mechanics