Several researches are interested oin convection heat transfer, owing to its large applications in many domains, such as the cooling system of electronic equipment, compact heat exchangers, and cooling nuclear reactors. The enhancement of heating or cooling in an industrial process may improve storage energy, reduce process time, raise thermal rating, and extend the lifetime of equipment. However, some processes may be affected qualitatively by the enhanced heat transfer. Therefore, developing a new heat transfer fluids becomes a challenge in order to improve the capacity cooling requirements. Traditionally, heat transfer fluids, such as water, ethylene glycol, and engine oil have poor heat transfer properties compared to the mostly used particles solids. In 1873, Maxwell [1] proposed to suspend small particles in fluids. Thus, improving the thermal conductivity is an efficient tool to enhance the heat transfer characteristic of conventional fluids. Thanks to the nanotechnology progress, the possibility of preparing nano-particles becomes easier. In order to meet the huge increasing need of heat transfer enhancement, suspending of nanoparticules in based fluid has been suggested for the first time by Choi [2]. Nanofluids are liquids containing suspensions of particles having a size less than 100 nm. The potential advantages of properly engineered nanolfuids include higher thermal conductivities, compared to that predicted by currently available macroscopic models. Moreover, it presents a better stability than those fluids containing micro-or milli sized particles. Theoretical and experimental investigations have been conducted to estimate the effective thermal conductivity of nanofluids. Most of the experimental studies (Yoo et al. [], Choi et al. []) show that the measured thermal conductivity of nanofluids is much larger than the classic theoretical predictions (Hamilton and Crosser, 1962 []). Many researchers have focused their investigations on improving thermal conductivity by modifying the particle volume fraction, size,, and shape, as well as based fluid.