Flow boiling heat transfer characteristics using the modified Eulerian and wall heat balance model

Charles Okon, Ali Turan

Research output: Contribution to journalArticlepeer-review

Abstract

Flow boiling heat transfer is encountered in nuclear reactors, steam engines and other engineering applications. Although several researchers have carried out different numerical and experimental investigations on flow boiling, the underlying physics of the interfacial interaction is still a complex phenomenon to understand in detail. Hence, the numerical optimisation of the flow boiling parameters has been conducted in this study using the Modified Eulerian-Eulerian Model (MEEM) and Wall Heat Balance Model (WHBM). For predicting the different fluid flow fields and provide detailed approximate information on the flow behaviour, this study considered the uniform axial heating profile of the cylindrical flow channel. The MEEM Multiphase sub-models and Raynolds Average Navier Stokes (RANS) turbulence model used to predict the temperature distribution along the wall, the average void fraction, tracking of the single bubble detachment diameter, heat balance at the wall, effect of surface roughness on heat transfer, the effect of aspect ratio, and the critical heat flux. The results obtained from this study compared with some numerical investigation and experimental data. The present study shows a better approximate prediction (with minimal uncertainties) of both the subcooled boiling heat transfer and the saturated boiling heat transfer. In summary, this study agrees with extant theories and experimental predictions. Thus, it has provided more profound insights into flow boiling heat transfer particularly for flow in a vertical pipe.
Original languageEnglish
JournalHeat and Mass Transfer: Waerme- und Stoffuebertragung
Early online date29 Apr 2020
DOIs
Publication statusPublished - 1 Aug 2020

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