Airflow pattern around a worker in a uniform freestream.
The effect of boundary layer separation on worker exposure is an important factor in the design of local exhaust ventilation. Three-dimensional airflow around a mannequin is examined by using flow visualization techniques and hot-film anemometry. Above the chest, a downwash effect is noted; from the chest to the elbows, a combination of downwash and vortex shedding is observed; and from the waist to the hip, vortex shedding appears to be dominant. A coherent vertical flow structure is observed close to the body. Vortex shedding frequency is determined by using hot-film anemometry. The dimensions of the reverse flow region and the area of the vortices are estimated from flow visualization videos.
Kim
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T
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill 27599-7400.
Flynn
M R
MR
D006801:Humans; D008954:Models, Biological; D016272:Occupational Health; D012212:Rheology; D014691:Ventilation / Q000379:methods*