Heat transfer and friction correlations required to describe steam--water behavior in nuclear safety studies

Abstract

The description of two-phase flow is important in nuclear safety studies.Recent two-phase flow descriptions are based upon unequal phase velocities and unequal paase temperatures (UVUT) theories with interphase interaction terms.These theories are more mechanistic than homogeneous theories and require more and different types of correlations than homogeneous theories.The UVUT theories require correlations (or models) which describe wall and interphase mass transfer, friction, momentum transfer, and heat transfer for all flow regimes and heat transfer regimes.A set of correlations is presented in this paper which can be used with UVUT theories.These correlations cover the complete range of parameters needed and in all cases are expected to yield reasonable numbers.