FILMWISE CONDENSATION APPLIED TO CONTAINMENT STUDIES: CONCLUSIONS OF THE TOSQAN AIR-STEAM CONDENSATION TESTS
Jeanne Malet, Emmanuel Porcheron, Jacques Vendel (IRSN) - NURETH 11th, Avignon, France, October 2-6, 2005.
An analytical study of condensation flows in the presence of non-condensable gases in a large containment vessel has been performed. Analysis of the experimental results is performed using extensive local measurements. Local total heat transfer coefficients and condensation mass-flow rates are determined using different approaches: coolant energy balance, degradation factors, heat and mass transfer analogy. For the two last approaches, different references or methods can be found in the literature and are analyzed in this paper. The first objective of this paper is to check if the condensation models generally used for analytical/laboratory experiments can be applied in a larger vessel. Experiment have been done in the TOSQAN facility and it can be seeen that the condensdation models used here are also valid for TOSQAN.The second objective of this paper is to evaluate the influence of different parameters used in the condensation models: the way of calculating the bulk mean temperature can have an influence for stratified tests; the influence of the compressibility effect is also not negligeable if tests are performed at higher pressure (4-5 bar); and the expression of the diffusion coefficient, which is a linear factor of the mass transfer rate , can have a significant role.