One dimensional (1D) numerical simulations have been carried out of heated parallel channel experiments using the linear frequency domain approach to investigate the effect of wall heat on the system’s stability for supercritical water in vertical heated channels. Oscillatory instability boundaries of the experimental cases with two different wall thicknesses and uniform power distribution are produced, assessed and discussed. These new numerical results with wall heat are compared with experimental data and previous numerical results without wall heat. There is improved agreement on the stability boundary predictions when the wall heat storage effect is included. However, the effect of wall heat storage was small for these experiments.

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