“…The pre-exponential factor and activation energy of an Arrhenius law were determined by Eoh et al, but only for the specific case of a CO 2 -Na flat free surface contact, without continuous mixing. In the case of leakage inside a CO 2 -Na heat exchanger, an underexpanded CO 2 -into-liquidsodium jet would form, due to the extremely high CO 2 -to-Na operative pressure ratio (more than 200 bar in the CO 2 side and nearly atmospheric pressure in the sodium side (Floyd et al, 2013)): the contact mechanism between sodium and CO 2 is, therefore, significantly different from a flat surface contact. The global kinetics parameters are fundamental in order to develop a numerical model of the leakage, which, in turn, would be useful to understand the production rate, the space and time distribution of the solid products as well as the temperature variation inside a Na-CO 2 heat exchanger and on the tube surfaces, following a leakage scenario.…”