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KMID : 0895420000100020140
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Journal of Korean Society of Occupational and Enviromental Hygiene
2000 Volume.10 No. 2 p.140 ~ p.149
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Prediction of Worker´ s Exposure in a Uniform Freestream
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김환태/Kim, Hwan Tae
정유진/김태형/하현철/Jung, Yu Jin/Kim, Tae Hyeung/Ha, Hyun Chul
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Abstract
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In industrial field, there are several operations where a horizontal unidirectional airflow is used to control airborne contaminants. When a worker is immersed in a uniform freestream, a recirculating airflow can be created downstream of the worker by the phenomenon of boundary layer separation. If the contaminant source arid the breathing zone are within this near-wake region, high exposure may occur. The investigation for the effect of contaminant source location on worker exposure was performed by using CFD(Computational Fluid Dynamics). The airflow field was numerically calculated by assuming a steady flow and using the standard k-ε turbulence model. As the results were compared with experimental data, the applicability of CFD was successfully verified. Subsequently, the breathing zone concentrations of the worker were predicted and compared with experimental data. The effects of contaminant density and turbulence intensity of freestream on worker exposure were evaluated.
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KEYWORD
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