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Boiling flows are frequently found in industry and engineering due to the large amount of 12 heat that can be transferred within such flows with minimum temperature differences. In the 13 nuclear industry, boiling affects in different ways the operation of almost all water-cooled 14 nuclear reactors. Recently, the use of Computational fluid dynamic (CFD) approaches to 15 predict boiling flows is increasing and, in the nuclear area, CFD is being developed to solve 16 thermal hydraulic safety issues such as establishing the critical heat flux, which is perhaps the 17 major threat to the integrity of nuclear fuel rods. In this paper, the accuracy of an Eulerian -

In the context of computational fluid dynamic simulations of boiling flows using time-averaged 13Eulerian multi-phase approaches, the many sub-models required to describe such a complex 14 phenomena are of particular importance. Of interest here, wall boiling requires calculation of the 15 contribution of evaporation to global heat transfer, which in turn relies on determination of the 16 active nucleation site density, bubble departure diameter and frequency of bubble departure.

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