Abstract
A computational analysis was performed to ascertain the effect of nanofluids on heat transfer in a flat tube heat exchanger of a car radiator. The nanofluids Al2O3/H2O and CuO/H2O were used with nanoparticles of different diameter in the range of 10-60 nm. A single-phase approach was implemented in the analysis. The heat transfer coefficient was calculated at various Reynolds numbers (250, 750, 1250, and 1750) with several nanoparticle concentration by volume of 1%, 3%, and 6%. Results indicated that the heat transfer rate increased with increase in the concentration by volume of nanoparticles. Whereas the decrease in the diameter of nanoparticle favored higher heat transfer rates. Therefore, the maximum heat transfer rate was observed at 6% concentration and at 10nm diameter size for both types of nanoparticles analyzed in this study for flat tube car radiator. The Al2O3/H2O nanofluid showed higher heat transfer rates than the CuO/H2O nanofluid at all Reynolds numbers.
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