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Modelling of contaminant transfer in a ventilated room, in the near-field of an emission source.

D. Guerra*(1), L. Ricciardi(1), J-C. Laborde(1), S. Domenech(2), CFA 2003 - 19th Congrès Français sur les Aérosols, 10-11th décembre 2003, Paris. (1) Institut de Radioprotection et de Sûreté Nucléaire, DSU / SERAC, Laboratoire d'Études et de Modélisation en Aérodispersion et Confinement, BP 68, 91192 Gif sur Yvette CEDEX(2) Laboratoire de Génie Chimique, Département Procédés et Systèmes, 118, route de Narbonne, 31062 Toulouse CEDEX

Document type > *Congrès/colloque

Keywords > aerosols - measuring methods, modelling

Research Unit > IRSN/DSU/SERAC

Authors > GUERRA Davide, LABORDE Jean-Claude, RICCIARDI Laurent

Publication Date > 12/01/2004

Summary

Nowadays, predicting the space-time evolution of a contaminant concentration in a ventilated room remains hard to achieve. Our study, carried out within the framework of a thesis, consists in modelling dispersion of a contaminant in a part of the room, corresponding to the near-field emission source, following an accidental rupture of a containment enclosure (fume cupboard, glove box…).. The final model should be written as correlations giving space-time evolution of the contaminant concentration which should be a correlated function of various parameters : geometry of the leak (slot or circular opening), type of emission (continuous or puff), velocity and duration of the emission, nature and initial concentration of the contaminant (gas or particles), influence of ventilation and obstacles (room walls). The literature review and the first simulations carried out with Computational Fluids Dynamics software packages (CFX and FLOVENT) dealt essentially with steady flows (free jets, plumes, buoyant jets). The current experiments consist in emitting puffs of gaseous contaminant simulated by gas tracers (helium and sulfur hexafluoride gas), in a full scale ventilated room. The measurements performed give the real-time evolution of tracer concentration. The results are then compared with simulations of puffs run in parallel and should validate the contribution of CFD tools in developing the required models. The presentation submitted summarizes the results obtained in the case of a leak characterized by a circular opening (diameter ranging between 5 mm and 5 cm) and an emission velocity ranging between 2 m/s and 50 m/s. From these results, a first formulation of the required final correlation is derived.

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