Velocity fields in proximity of local exhaust hood openings: an intercomparison between current recommended formulas and experimental studies

This article is the second part of a previous paper [F. Cascetta, Building and Environment 31, 437449 (1996)] which illustrated the test facility in use, the measurement procedure, and fully described the velocity fields in front of hood openings. A comparison between the main current formulas available in the literature, and the experimental results collected by the authors, is introduced and discussed. The predicted centerline velocities inferred from the recommended for- mulas are compared with the ones experimentally measured by the authors, for both plain and flanged,free-standing circular and rectangular exhaust openings. The velocity field outside the axis of the exhaust hood is also presented. It was experimentally determined and is expressed in terms of velocity contours.