Abstract
In order to examine the hybrid nanofluid heat transfer, experiments are performed in a horizontal heated tube. The mixtures of alumina and titania solid nanoparticles into pure water are considered to enhance heat transfer. The preparation of hybrid nanofluid has been conducted with different volume concentration from 0.5% to 2% and size of diameter of 30 to 45 nm and thermal properties have been measured experimentally. The pressure drop and heat transfer through the test rig are studied. Reynolds number and volume flow rates are measured in the range of 500 to 1700 and 0.6 to 4.5 L per minute respectively. Results show that the pressure drop decreases with increase of the volume flow rate and slightly increases with increasing of the hybrid nanofluid volume concentration. Furthermore, heat transfer enhancement increases by increasing of hybrid nanofluid volume concentration and volume flow rate. It was observed that the low volume concentrations of hybrid nanofluid application can enhance heat transfer to 30% as compared with pure water. (C) 2021 Elsevier Ltd. All rights reserved.