The Implementation of an Activated Temperature Dependent Wall Boiling Model in an Eulerian-Eulerian Computational Fluid Dynamic Approach for Predicting the Wall Boiling Process

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