Industrial local extract systems for thermally influenced extension of pollutants

Improving the design and application of local extract systems (LES) require s the analysis of the interactions between the captured air volume flow, th e spread of pollutants and the disturbing air movements, e. g. crossflow, i n a controlled environment. These interactions were investigated in a resea rch project for the case of thermal airflow together with crossflow. The pr oject was based on Computational Fluid Dynamics (CFD) calculations and exte nsive experimental investigations in a test rig for collecting devices. Imp roved LES design methods developed for easy use are published in a national Design Guide Book (in German) of the German Federal Institute for Occupati onal Safety and Health (FIOSH).