Comparison of two nucleus spectrum measuring devices and the influence of several variables on cavitation threshold in water
Abstract
Nucleus spectrum measuring systems were evaluated by measuring natural nuclei content of tap water. The Coulter counter technique which is used extensively in blood cell counting, and relies upon the electrical conductivity of the liquid, and a light scattering technique were both found to be adequate for nucleus spectrum measurement for special cases. The light scattering method is especially advantageous when the water samples contain particles. Inception pressures for cavitation were measured using a sonic horn assembly operating at about 14 KHz. Tap, filtered tap, and degassed tap water samples were used to measure cavitation inception pressures as a function of temperature, gas content, waiting time, addition of different kinds of particles, polymer and wetting agent, magnetic field and fast neutron irradiation. The conical crevice theory was found to be predicting behavior of the inception pressures close enough for most of the variables mentioned. The nucleation pressure was calculated. The conical crevice diameters at the interface are calculated using the bubble dynamics equation, and measured cavitation inception pressures.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- May 1974
- Bibcode:
- 1974PhDT.........7Y
- Keywords:
-
- Cavitation Flow;
- Nuclei (Nuclear Physics);
- Spectrum Analysis;
- Water;
- Conical Flow;
- Light Scattering Meters;
- Nucleation;
- Instrumentation and Photography