LAUSR

Abstract In this paper, natural convection heat transfer of nanofluids in a rectangular cavity investigated while two heated fins are located in the cavity. The governing equations are solved by finite element method (FEM) using FlexPDE commercial package software. Water is considered as the base fluid and two nanoparticles (TiO2 and Al2O3) are added as the second phase or additives to base fluid. The problem is solved for different nanoparticles volume fraction and fin height to study the effect of these parameters on the local and average Nusselt numbers. Results show that maximum point of local Nusselts numbers (which occurs along the fins locations) for the TiO2 is larger than Al2O3 except when the φ = 0.09. Also, TiO2 leads to more average Nusselt number as well as larger fins height in most cases.