Natural convection is the most important phenomenon regarding the heat transfer. An experiment is conducted here for an elliptical cylinder to find an equation for Nusselt number by which we can easily find out the amount of heat transfer. In this research, the inclinations observed at 00, 300, 450, 600, 900 at the axis ratio of 1:4. The cylindrical is cooled naturally and analysis is done on it. The equation of Nusselt number is obtained experimentally. This results are validated using CFD simulations. There is + 10% of error is detected between experimental and CFD simulation.