Experimental Investigation of Combined Effect of Particle Size and Stability of Al2O3-H2O Nanofluid on Heat Transfer Augmentation Through Horizontal Pipe

Abstract

The stability of nanofluid plays a rule in heat transfer growth for differentengineering systems. The stability and particle size of Al2O3-H2Onanofluid effects on heat transfer are studied experimentally. Two particlesizes (20 and 50 nm) with (0.1, 0.5 and 1%) concentrations were preparedand tested under constant heat flux (1404 W) with fully developedturbulent flow through a horizontal pipe. The results show an increase inNusselt number by 20.7% and 17.6% with 1 vol.% concentration for 20and 50 nm, respectively compared to distilled water. Examined nanofluidshowed improvement in Nu number by (30.3 and 23.5) % at 1 vol.%concentration compared to water. Obtained results show minor decreasein the pressure drop and friction factor with nanofluid after stabilitytreatment. Different correlations between Nu number and friction factorrelating to studied parameters were observed