Abstract
Point of net vapor generation (PNVG) was investigated based on the void fraction dataset obtained by using high-frame-rate neutron radiography. The test channels used in the experiment were rectangular channels heated from one side with gap thickness of 3 and 5 mm, channel width of 130 mm, and heated length of 100 mm. This study focused on (1) the instantaneous and time-averaged PNVG, (2) the effects of system parameters on PNVG, (3) the applicability of existing PNVG correlations to the channels with short heated length, and (4) effect of the PNVG in CHF, model. The following results were obtained : (a) the effects of system parameters on the thermal, equilibrium quality at the PNVG are not significant in the present conditions, (b) existing PNVG correlations tend to underestimate the thermal equilibrium quality at the PNVG, and (c) the accuracy of Katto's CHF model could be improved significantly by calculating the PNVG with high accuracy.
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