Numerical study of free convection heat transfer from an assembly of vertical cylinders of PARR-2 in steady state reactor operation

In this paper a detailed study of free convection heat transfer from an assembly of vertical cylinders of Pakistan Research Reactor-2 (PARR-2) under the steady state reactor operation has been presented. For this purpose a computer code has been developed to numerically solve Navier Stokes equations in cylindrical coordinates in 2 dimensions, representing the thermal hydraulic behavior of a typical fuel pin in Pakistan Research Reactor-2. The temperature and velocity profiles and Nusselt number variations have been studied and results have been presented. The computer code developed for this study has been validated against experimental results carried out in previous studies at different occasions. Average outlet Coolant temperature simulated by computer code, at different wall heat fluxes, has been found in good agreement with experimental results. (author)