Turbulaent heat transfer to near-critical water in a heated curved pipe under the conditions of mixed convection

摘要

Numerical modeling was performed to investigate the developing turbulent flow and heat transfer characteristics of water near the critical point in a curved pipe. The renormalizatio group KAPPA - epsilon model was used to account for the turbulent flow and heat transfer in the curved pipe at a constant wal temperature with or without buoyancy force effect. A control volume finite element method was used to numerically solve the three-dimensional fully elliptic governing equations for the problem. Due to the great variations in physical properties of water near the critical point, the turbulent structurecan be significantly altered compared with the pure forced convection int he curved pipe. This study explored the influence of the near-critical pressure and wall temperature ont he development of fluid and heat transfer alogn the pipe.