Abstract
Numerical simulations were used to determine the capture efficiency of an unflanged rectangular exhaust opening in a uniform flow parallel to the hood centre-line. The simulations were performed by the FLUENT computer code based on the finite volume method, using the standard k-ε turbulence model. After calculating the turbulent air flow field, a large number of submicrometre particles were released in different locations in front of the exhaust opening and the destination of the particles was determined. The capture efficiency was calculated as the ratio of the number of the particles captured by the exhaust hood to the number of the particles released. The calculations were verified by tracer gas measurements. The calculated capture efficiencies were in satisfactory agreement with the experimental values. The results show also that a uniformly directed airflow may be used to enhance the capture efficiency of exhaust hoods.
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