In this paper, the Adomian decomposition method is applied to determine the efficiency and the effectiveness
of a heat-generating sinusoidal pin fin, involving convective and radiative heat transfers with different environments. The developed analytical solution takes into account the fact that several characteristics of sinusoidal pin fin are temperature-dependent. The parameters considered to be temperature-dependent are the thermal conductivity, the convective heat transfer coefficient, the emissivity, and the heat generation rate. To check the applicability of the analytical method, a numerical solution is carried out using the finite volume approach. Results from Adomian decomposition method were used to investigate the effect of various parameters on the thermal performances of the sinusoidal pin fin. These results show a good agreement with numerical data. In addition, sinusoidal pin fins are found to perform better than the conventional pin fins with uniform cross section.