On the Breakdown of a Vortex
Abstract
The physical problem presented in this paper is water rotating steadily in a vertical cylinder with a specified tangential influx. Water is withdrawn through a sink in the center of the base of the cylinder. Laser Doppler velocimetry is utilized to obtain velocity data in and near the viscous vortex core region, the viscous boundary layer, and the near irrotational region. Of particular interest is the region near the sink where the viscous core interacts with the bottom boundary layer. The core radius is measured for various circulations with fixed sink radius and water column depth. Tangential and axial velocity measurements are taken through the viscous core and into the near irrotational region for various circulations with fixed sink radius and water column depth and at various radial and axial locations. Axial and tangential velocities are measured near and in the bottom boundary layer. A flow visualization technique is developed to display qualitative data on the flow where the boundary layer and viscous core interact. (jhd)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 22, 1990
- Accession Number
- ADA227066
Entities
People
- Douglas E. Reckamp
Organizations
- United States Naval Academy