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AN EXPERIMENTAL STUDY ON POST-CHF HEATTRANSFER FOR LOW FLOW OF WATER IN A 3x3 RODBUNDLE
문상기,백원필,조석,SE-YOUNG CHUN,SE-YUN KIM 한국원자력학회 2005 Nuclear Engineering and Technology Vol.37 No.5
An experimental study on post-CHF heat transfer has been performed with a 3x3 rod bundle using a vertical steam-water two-phase flow at low flow conditions. The effects of various parameters on the post-CHF heat transfer are investigated and the reasons for the parametric effects are discussed. As the heat transfer regime changes from CHF to post-CHF, the radial wall temperature distribution is changed depending on the pressure and the mass flux conditions. The superheat of the fluid increases considerably with an increase of the wall temperature (or heat flux) and with a decrease of the mass flux. This implies, indirectly, a strong thermal non-equilibrium at high wall temperature and low mass flux conditions. In order to improve the prediction accuracy of the existing post-CHF correlations, it is necessary to perform more experiments, particularly direct measurement of the vapor superheat, and to modify the correlation by considering a strong thermal non-equilibrium at low flow and low pressure conditions.