Evaluation of condensation models on TOPFLOW experiment
Résumé
Some condensation models were evaluated in this work using TOPFLOW experiment, in which saturated steam bubbles are injected in sub-cooled water inside a vertical pipe. At different heights, the void fraction, velocity and bubble size distribution were measured as radial profiles. A monodispersed approach was used for CFD simulations with Neptune_CFD code. The results obtained with this code slightly overpredicts the void fraction at the first 1.5 meters of the pipe and underestimates it above 1.5m. The void fraction depends of heat and mass transfers between phases, which is linked to the interfacial area and so, to the fragmentation and coalescence phenomena. As a consequence, an analysis of the experimental results will be done to
investigate the role of each phenomena. Then, the most appropriate condensation model will be used.
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