NATURAL VIBRATION AND DAMPING OF GAS BUBBLES IN LIQUIDS,

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 0.66/d 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)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1943
Accession Number
AD0662651

Entities

People

  • Erwin Meyer
  • Konrad Tamm

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Analyzers
  • Diameters
  • Electrodes
  • Frequency
  • Frequency Shift
  • Mechanical Waves
  • Microphones
  • Motion
  • Radiation
  • Resonance
  • Resonant Frequency
  • Sound Transmission
  • Spectra
  • Vibration
  • Waves

Readers

  • Library and Information Science/ Studies, Southeast Asia Studies, Bibliography of Vietnam and Lao Studies.
  • Spectroscopy.
  • Underwater engineering and Marine Technology.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers