Roughness Characteristics of Plane Surfaces Based on Velocity Similarity Laws.
Abstract
Some common problems of surface measurement and ambiguities of description are discussed and it is shown that numerical discrepancies of a factor of 20 can result from the latter. A comprehensive programme of roughness measurement on working surfaces is described associated with a programme of flow measurement in an open flume in an attempt to isolate a range of surface wavelengths responsible for drag. A feasibility study of roughness measurement on coated surfaces is followed by measurements on hull replicas, gravel and coated steel plates. Measurements of an ablative coating system before and after an ocean voyage demonstrates a loss of roughness associated with a smoothing of peaks. Flow measurements suggest that surface wavelengths of less than 100 microns do not interact with the fluid. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1981
- Accession Number
- ADA095061
Entities
People
- K. B. Chuah
- M. J. Kings
- S. T. Olszowski
- T. R. Thomas