Mass diffusion from a point source in a turbulent boundary layer over a rough surface
Turbulent diffusion of dynamically passive and chemically nonreactive matter from a simulated point source within a two-dimensional boundary-layer flow over a rough surface was studied. A rough surface consisting of two-dimensional roughness elements (wooden strips, 0.25 in. high, 0.25 in. wide, and 6.0 ft. long, placed 3.0 in. apart normal to the flow direction) was used with the source at three different heights. The free-stream velocity of air for most of the runs was 12.50 ft./sec. Concentrations of the diffusing plume were measured at several downstream distances from the point source located ...
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