AT-90-05-1 -- Three-Dimensional Analysis of Air Flow Pattern and Contaminant Dispersion in a Ventilated Two-Zone Enclosure PDF

The pattern of an isothermal air flow caused by infiltration and ventilation in a three-dimensional, two-zone enclosure was investigated by numerical simulation. The two zones are separated by a partition with a door opening. Two types of boundary condition for air supply are considered. (1) The outside air uniformly infiltrates through an end-wall into the enclosure and leaves through a ceiling-mounted exhaust opening, and (2) the ventilation air flows into the enclosure through a rectangular supply opening near the floor on one of the end-walls and leaves the enclosure through the exhaust opening. For each type of boundary condition, two different exhaust opening locations, each with three door positions, are studied. Contaminant concentration distributions for different cases are also presented to illustrate the influences of the flow pattern on the removal of the contaminant generated in one of the two zones. The results show that the location of the door not only guides the direction of the air movement but also affects the strength of the air circulation in the downstream zone, while the upstream zone is less affected by the door position.

KEYWORDS: air flow, contaminants, isothermal, air infiltration, ventilation, air movement, doors, air cleaning, zones, rooms, internal walls, calculating.