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1 Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

1 1999

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Coupled thermal and physico-chemical analysis of multicomponent oxidic melt solidification

Journeau C., Sudreau F., Ramacciotti M., Cognet G.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

1999

Z. 67

265--274

The solidification of multicomponent melts with large solidification ranges, such as corium-concrete mixtures is studied. A methodology to estimate relevant physical properties from a thermodynamical computation is presented and applied to an experiment performer in the VULCANO facility. A thermal analysis provides the orders of magnitude of the solidification kinetics for the observed microstructures. Various phenomena in which physico-chemistry is coupled with heat transfer are described : the corium rheology, which affects convection, depends on the physico-chemistry and on the cooling rate; the density gradients which cause natural convections are strongly dependent of the solidification rate; solidification at the substratum contact creates a large thermal contact resistance which reduces sharply heat transfer at this interface.