Experimental study on aerosol penetration through cracked concrete walls
T. Gelain*, F. Gensdarmes, J. Vendel, CFA 2003 - 19th Congrès Français sur les Aaérosols, 10-11 décember 2003, Paris.
Within the framework of the safety assessment of the nuclear fuel facilities, we investigate the leakage of a reinforced concrete wall, cracked by shear stresses characteristic of a seism. The purpose of this study is to measure the retention of the aerosol particles in a cracks network formed by shear stresses. The measurement are carried out for upstream and downstream pressure drops ranging from 10 to 200 hPa, which are representative of the wind effect or the fire risk onto a building. After an aeraulic characterisation of the cracks network, we inject aerosol with a vibrating orifice aerosol generator. We study retention for 0.15 to 5 µm aerosol diameters (flow velocity v < 1 m.s-1) to study different deposition laws. The preliminary results show that, for low velocities, the retention of 1 µm aerosol particles into the cracks network decreases when the velocity increases because of the sedimentation of aerosol particles.