Convective boiling in a rod bundle: transverse variation of vapor superheat temperature under stabilized post-CHF conditions

Abstract Transverse variations of vapor superheat temperatures across a rod bundle are measured for convective boiling of water in the post-CHF regime. Significant differences in superheat (up to 120°C) are observed across the flow subchannels. The steepness of this transverse superheat profile decreases with increasing vapor Reynolds number.