Accession Number:

AD0662651

Title:

NATURAL VIBRATION AND DAMPING OF GAS BUBBLES IN LIQUIDS,

Descriptive Note:

Corporate Author:

DAVID TAYLOR MODEL BASIN WASHINGTON D C

Personal Author(s):

Report Date:

1943-04-01

Pagination or Media Count:

14.0

Abstract:

The natural frequencies and damping decrements of gas bubbles in liquids, especially in water and glycerin, were measured in the frequency ranges of 1.5 to 7 kilocycles and from 15 to 35 kilocycles. The results agree with calculations by Minnaert and Smith with respect to the resonance frequency expressed as 0.66d kilocycles, where d is the diameter of the bubble in centimeters. The decrement is composed of two parts, the constant component of radiation damping and a component proportionate to the frequency. At 25 kilocycles the decrement amounts to about 0.9. The measuring methods were as follows In the range of 15 to 35 kilocycles the release of bubbles electrolytically produced on an electrode under conditions of sound transmission was observed, and the speed along the surface of the bubble as a function of the diameter was measured with a type of ribbon microphone. In the frequency range of 1.5 to 7 kilocycles the amplitude of the air bubbles as a function of the frequency was photoelectrically determined. Finally, the sonic spectra during the rise of air bubbles from a nozzle were recorded with a supersonic analyzer. Author

Subject Categories:

  • Acoustics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE