The heat transfer rate to a fluid flowing in pipe can be enhanced by the use of fins. This thesis concerned with computer simulation study of tube with different fins used to enhance their heat transfer performance subjected to natural convection heat transfer. In the present study the performance of a heated pipe having fins of various configurations using ANSYS 15.0 is analysed. The material under consideration is aluminium and the free stream fluid is air. Base width and height of the fin were kept constant for all the three types. The heat transfer rate from the fins and the overall heat transfer rate has been calculated and compared for various fin configurations. Also the overall heat transfer co-efficient has been found out. Temperature contours for various fin configuration has been plotted showing the convection loops formed around the heated pipe surface. After comparing it is shown that we can find that the best configuration for this type of convective heat transfer of a heated pipe is a trapezoidal fin as they have the highest total heat transfer rate.