An experimental study on post-CHF heat transfer in low flow conditions using a 3x3 rod bundle

An experimental study on post-CHF heat transfer has been performed with 3x3 rod bundle using vertical two-phase flow in low-flow condition. In this study, the effects of various parameters on the post-CHF heat transfer have been investigated and an applicability of conventional post-CHF correlations inlow-flow conditions has been estimated. Even if the equilibrium quality is less than I, fluid temperatures of subchannel near the test section exit are larger than saturation temperature. This means that the post-CHF heat transfer phenomena are in thermal non-equilibrium state. Although the effects of pressure and inlet subcooling on post-CHF heat transfer was negligible, post-CHF heat transfer coefficients largely increase with Reynolds number of steam. Conventional post-CHF heat transfer correlations do not show reliable predictions of the post-CHF heat transfer coefficients