Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

In this work, we report on the development of a time-averaged Eulerian multiphase approach
applied in the wall boiling process especially in the forced convective boiling process. Recently, in order to
obtain accurate bubble dynamics and reduce case dependency, a single bubble model for nucleate boiling
based on known published models was developed. The model considers geometry change and dynamic contact
and inclination angles during bubble growth. The model has good agreement with experiments. However, the
predicted bubble dynamics is dependent on the wall superheat (cavity activation temperature). This single
bubble model requires an update of the current nucleation site activation and heat flux partitioning models in
time-averaged Eulerian multiphase approaches. In this presentation, we will introduce this implementation in detail.
Further, with help of the MUSIG (MUltiple SIze Group) model, a breakup and coalescence model and GENTOP concept, this approach could simulate the bubble size distribution and further flow pattern and partten transitian in a heated pipe. With thenecessary calibration of the nucleation site density, the comparisons between the calculation results and DEBORA experiments demonstrate the success of the implementation and the accuracy of this approach.