The air flow of two dimensional Aaberg slot exhaust hoods.

Exhaust hoods are used in many industries to remove contaminant from a region close to the source( s) of the generation by the withdrawal of air and contaminant. In comparison with traditional exhaust hoods, the Aaberg exhaust system, with its additional jet, can significantly improve the capture efficiency of the hood. Since the 1980's experimental investigations and mathematical analyses on the Aaberg exhaust systems have been performed by Hogsted (1), Hyldgard (2), Pedersen and Nielsen (3) Fletcher and Saunders (4) and Hollis (5). Hunt and Ingham (6) have employed a combina-tion of analytical and numerical solutions of the governing mathematical equations. In this paper the numerical results of the air flow of an Aaberg exhaust system, schematically shown in Figure 1, are produced by using both a theoretical model, which is associated with the boundary integral technique, and the standard k-s model, which is associated with the control volume technique.