TURBULENT DISPERSION IN A PIPE FLOW
Abstract
Turbulent diffusion from a point source in a pipe flow has been studied. It was desired to verify Richardson's law and to evaluate the parameter B in Lin's derivation of that law. Difficulties were encountered and the data obtained were insufficient for these purposes. A very considerable quantity of novel and useful information was nevertheless gathered. The scattered-light technique was used to map the fileds of point-concentration fluctuations and of the mean concentration in the diffusion plume. The relative intensity of the point-concentration fluctuations was found to be of the order of 100% on the plume axas and increased toward the plume edges. The parameters in Taylor's theory were evaluated; the intensity of fluctuations in the radial components of the velocity of a diffusing particle was estimated to be 2.84% of the centerline velocity in the pipe, and the Lagrangian (spatial) integral scale was found to be of the magnitude of 8.3% of the pipe radius. The value resulting for the turbulent Peclet number (the product of pipe diameter times centerline velocity divided by turbulent diffusivity) is 852.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1963
- Accession Number
- AD0423938
Entities
People
- H. A. Becker
- J. R. Gwozdz
- R. E. Rosensweig