Effects of flexible roughness elements on diffusion in a turbulent boundary layer
Diffusion of ammonia gas from a line source within a turbulent boundary layer, formed by flexible roughness elements fixed on the floor of a wind-tunnel test section, was studied. The flexible roughness elements consisted of plastic strips (0.25 in. wide, 0.01 in. thick and 4 in. high) fastened to wooden strips with transverse spacing of one element per linear inch and a spacing in the direction of flow of one row every 2 in. They were arranged with their broad side facing the direction of wind. The free-stream ambient velocity was 20 ft./sec. The line source was placed at different locations ...
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