Experimental Investigation of the Forced Convective Heat Transfer Coefficient of Nanofluid in the Double-Pipe and Plate Heat Exchangers

Nanofluids are suspensions of nanoparticles in base liquid and can be employed to increase heat transfer rate in various applications. In this work forced convective heat transfer coefficient of Al2O3/Ethylene Glycol nanofluid have been investigated experimentally in the double-pipe and plate heat exchangers. Experimental results indicate that heat transfer coefficient increases with nanoparticles concentration as well as operating temperature. Considerable deviations for high operating temperatures and nanoparticles concentration were observed from comparison of experimental and semi-empirical correlations’ results. The nanofluid Nusselt number for different nanoparticles concentrations as well as various operating temperatures was obtained and shown the enhancement up to maximum 50% using nanoparticles.