Abstract
Three-dimensional (3D) numerical simulations were carried out of two vertical heated parallel channel experiments using ANSYS CFX to investigate the effects of wall energy storage on the system's stability boundary of a supercritical water up-flow system. Oscillatory instability boundaries of six experimental cases with two different wall thicknesses and uniform power distribution were produced, assessed and discussed. The 3D numerical solutions of the instability boundary with wall energy storage are in very good agreement with the experiments, which is believed to be a significant advance on previous work in this area. Results from a 1D linear code with wall thermal energy storage are also included for reference. The commonly used modelling assumption of circumferentially symmetric flow was found to be inadequate when modelling the wall heat storage. Temporal and spatial independence were ensured for the reported cases. The prediction of the oscillation periods obtained with CFX are also discussed.
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