Flow Regime Analysis of Forced Flow Boiling Hydrogen Subjected to High Heat Flux

This paper presents an analysis of forced flow two-phase hydrogen heat transfer data for the purpose of interpreting the various flow regimes of inverted annular flow. Hydrogen heat transfer data available from an early 1960s NASA experimental investigation were used for the analysis. The data was evaluated in light of a heat transfer characteristics map and related flow pattern map which were established by more recent work on inverted flow film boiling of freon R113. It was shown that the hydrogen data exhibit the same three flow patterns as found in the R113 data. This may allow the use of film boiling heat transfer models developed for such fluids to be used for hydrogen film boiling heat transfer predictions.