Suction hoods are used on a wide-spread basis in ventilation equipment in order to capture harmful substances released by process equipment. The efficiency of such devices is dependent not only on the relative position of the source of contamination and that of the suction hood but also on suction uniformity. Where the location of the source and that of the suction hood is misaligned, the need arises to put in place an uneven velocity field in the suction hood. This papers explores the flow of hazardous substances from the “source” to the “sink” located at an angle of 180 degrees relative to each other. Collection efficiency was determined numerically by means of the Fluent software as well as experimentally. A screen was mounted inside to ensure uneven suction. The study yielded flow current lines and constant temperature lines. It also helped to define maximum suction intensity. The findings may be used for designing ventilation systems intended for industrial buildings.

The heat released by local exhaust ventilation is one of the most common hazards emitted during various industrial processes in industrial buildings. This work solves problems in order to find the numerical solution model that most adequately describes the development of a free convective jet above a flat heat source and a convective jet near the side hood located above the heat source. Various turbulence models and options of wall functions are considered for application in the study of a free convective jet. The data showed that the closest to theoretical results are those obtained when using the standard k-e model together with standard wall functions.