Computer simulation of natural convection heat transfer from an assembly of vertical cylinders of PARR-2

In this paper a Computer Code COSINAC (Computer Simulation of Natural Convection from Assembly of vertical Cylinders) has been developed to simulate the natural convection heat transfer from an assembly of vertical cylinders of Pakistan Research Reactor-2 (PARR-2), under the steady state reactor operation. The momentum and energy equations in cylindrical co-ordinates, representing the thermal hydraulic behavior of a typical fuel pin in Pakistan Research Reactor-2, have been solved numerically for a two dimensional axisymmetric domain. The temperature and velocity profiles and Nusselt number variations have been studied and results have been presented. The computer code COSINAC 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.