Nowadays, predicting the space-time evolution of a pollutant released in a ventilated room including a process operation remains hard to achieve. However this prediction is imperative in hazardous activities such as nuclear ones. Our study consists in predicting space-time evolution of a contaminant concentration C(x, y, z, t) in the near-field emission source of contamination. The proposed model is written as a correlated function of various parameters: leak geometry (slot or circular opening), emission type (continuous or puff), initial velocity and emission time. An instrumented experimental pilot device is used to simulate pressurised gas industrial failure and the measurements performed give the real-time evolution of tracer gas concentration. Puffs simulations are run in parallel with the Flovent code for a thorough parametric study. The comparisons between numerical results and experimental ones are in good agreement and a first formulation of the required final correlation is derived.
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, France,
tel. +33 1 69 08 47 65, fax. +33 1 69 08 36 80, e-mail : email@example.com;
2- Laboratoire de Génie Chimique, Département Procédés et Systèmes, 118, route de Narbonne, 31062 Toulouse CEDEX, France