Cavitation Near Surfaces of Distributed Roughness
Abstract
This investigation consists of an experimental study of cavitation inception and the associated bubble dynamics in turbulent boundary layers adjacent to surfaces roughened with two-dimensional triangular grooves. The project was initiated due to the apparent lack of published information on the effects of distributed roughness on cavitation inception as opposed to the effects of isolated irregularities. The experimental program covers the measurement of mean velocity profiles, turbulence intensity and the determination of the cavitation inception index for turbulent flow adjacent to both smooth and rough boundaries. In all cases the test liquid was water at room temperature. Four triangular roughness patterns were tested, consisting of roughness heights of 0.100, 0.050, 0.025, and 0.0125 inches, respectively. The maximum velocity was varied between the limits 16 to 51 feet per second. For the same conditions, cavitation flow was observed by high speed motion pictures. Data concerning bubble distribution, stability, and growth rate were obtained from the photographs and correlated with existing theory.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0819521
Entities
People
- Arthur T. Ippen
- Roger E. Arndt
Organizations
- Massachusetts Institute of Technology