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TURBULENT DISPERSION IN A PIPE FLOW
FUEL CELL RESEARCH STEERING COMMITTEE
Pagination or Media Count:
Turbulent diffusion from a point source in a pipe flow has been studied. It was desired to verify Richardsons law and to evaluate the parameter B in Lins 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 Taylors 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.
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