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Pool Fires – Heat and Mass Transfer Model for ECART Tool

pubblicazioni - Articolo

Pool Fires – Heat and Mass Transfer Model for ECART Tool

La memoria da proporre è relativa ad un modello di calcolo degli scambi di calore e di massa in un pool fire, in seguito implementato all’interno del codice ECART. L’attenzione è focalizzata sui pool di idrocarburi ed in seguito il modello è stato aggiornato e ampliato per comprendere i pool di sodio liquido.

This paper presents a mathematical model simulating some phenomena of the dynamical development of a pool fire. This model is finalized to quantify the vapor mass release rate, from the pool to the surrounding air, caused by pool liquid heating consequent of radiative and convective heat transfer phenomena between flame (and eventually other high temperature bodies) and pool. The lumped parameters grid theory is employed to model the pool heat transfer and vapor generation phenomena. The “grid” model has been developed to extend the capability of ECART numerical tool and his development was focused on the following implementation inside such code. After an approximate first validation of a model stand-alone version, it was implemented inside ECART. The model validation was carried out by comparison with references data and experimental pool fire test results performed by the model developer’s team. The maximum burning rate, the pool fire duration and the development of phases I (growth – transitory period corresponding to fire development), II (steady-state period corresponding to fully developed fire, with an about invariable burning rate) and III (exhaustion – transitory period preluding the end of fuel, during which both the size of flames and the burning rate decreased continuously up to fire extinction) are mainly analyzed. The model approach appears as a effective fast-running way for simulating the pool fire dynamics.

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