Abstract
In the design of push-pull local ventilation systems for fume or plume, it is of great importance to capture the pollutants of buoyant jet in the pull hood opening. To meet this demand, the effect of perfect capturing limit flow ratio on the pull hood Q_2/Q_1 were investigated experimentally for parameters in two-dimensional flow field. There are the pull opening ratio B_3/B_1, the push-pull distance ratio L/2B_1, the push flange ratio F_3/B_1, the pull flange ratio F_1/B_1, plume flow volume ratio Q_3/Q_1, and location (L_p, H_p) of plume as the parameters which are related to the design of push-pull ventilation systems.
