Abstract
The effects of scale and fluid properties on gas entrainment onset were experimentally studied for the free surface flow in an IHX vessel of a proposed Japanese demonstration FBR. Water experiments were performed using the 1 10 - th, 1 6 - th, 1 3 - rd and 1 1.6 - th scaled models of the IHX. The experimental results indicate that the scale has a strong effect on gas entrainment onset and that the critical Fr number decreases in proportion to the −0.5-th power of the scale. Applicability of a computational method to the gas entrainment is also discussed by comparing computational and experimental results.
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